Agents SDK Teams Bot crashes MSFT.Agents.Core.ProtocolJsonSerializer..cctor() with CLR (0x80131506)

Question

&nbsp;Teams Bot running off Azure Functions .NET 8 (isolated) crashes at Microsoft.Agents.Core.Serialization.ProtocolJsonSerializer..cctor() with Fatal error. Internal CLR error (0x80131506) when initializing Microsoft.Agents.Storage.BlobsHi team — I’m setting up context storage for a Teams bot using the Microsoft Agents SDK. When the message handler function executes, testing via adding the bot to a meeting chat, DI constructs BlobsStorage, the Functions worker process crashes with a fatal CLR error originating from the Agents serialization bootstrap.My issue seems related to these two issues:&nbsp;https://github.com/microsoft/Agents/issues/224&nbsp;https://github.com/microsoft/Agents-for-net/issues/386I have tried the recommended fix of pinning my installed packages to version 1.1.151, and I still encounter this error.&nbsp;csproj:&lt;PackageReference Include="AdaptiveCards.Templating" Version="2.0.5" /&gt;&lt;PackageReference Include="Azure.AI.OpenAI" Version="2.2.0-beta.5" /&gt;&lt;PackageReference Include="Azure.Data.Tables" Version="12.11.0" /&gt;&lt;PackageReference Include="Microsoft.Agents.Builder.Dialogs" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Agents.Core" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Agents.Storage.Blobs" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Azure.Functions.Worker" Version="2.0.0" /&gt;&lt;PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="2.0.5" /&gt;&lt;PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="2.0.2" /&gt;&lt;PackageReference Include="Microsoft.Agents.Authentication.Msal" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Agents.Hosting.AspNetCore" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Agents.Client" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Agents.Connector" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Agents.Storage" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Agents.Storage.Transcript" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Bot.Builder" Version="4.23.0" /&gt;&lt;PackageReference Include="Microsoft.Graph" Version="5.91.0" /&gt;&lt;PackageReference Include="Microsoft.Agents.Builder" Version="1.1.151" /&gt;&lt;PackageReference Include="Microsoft.Agents.Extensions.Teams" Version="1.1.151" /&gt;&nbsp;&nbsp; &lt;!-- Exclude TeamsFx wwwroot static files which are for frontend only. --&gt;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &lt;!-- Fix system package downgrade --&gt;&nbsp;&lt;PackageReference Include="Microsoft.NETCore.Targets" Version="5.0.0" PrivateAssets="All" /&gt;&nbsp;&lt;PackageReference Include="Microsoft.TeamsFx" Version="3.0.0" /&gt;&nbsp;&lt;PackageReference Include="Newtonsoft.Json" Version="13.0.3" /&gt;&nbsp;&nbsp;My full stack trace is below:&nbsp;&nbsp; &nbsp; &nbsp;Microsoft.Agents.Core.dll!Microsoft.Agents.Core.Serialization.SerializationInitAttribute.InitSerialization() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Agents.Core.dll!Microsoft.Agents.Core.Serialization.ProtocolJsonSerializer.ProtocolJsonSerializer() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Native to Managed Transition] &nbsp; &nbsp;&nbsp; &nbsp; &nbsp;[Managed to Native Transition] &nbsp; &nbsp;&nbsp; &nbsp; &nbsp;Microsoft.Agents.Core.dll!Microsoft.Agents.Core.Serialization.ProtocolJsonSerializer.SerializationOptions.get() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Agents.Storage.Blobs.dll!Microsoft.Agents.Storage.Blobs.BlobsStorage.BlobsStorage() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Native to Managed Transition] &nbsp; &nbsp;&nbsp; &nbsp; &nbsp;[Managed to Native Transition] &nbsp; &nbsp;&nbsp; &nbsp; &nbsp;Microsoft.Agents.Storage.Blobs.dll!Microsoft.Agents.Storage.Blobs.BlobsStorage.BlobsStorage(System.Uri blobContainerUri, Azure.Core.TokenCredential tokenCredential, Azure.Storage.StorageTransferOptions storageTransferOptions, Azure.Storage.Blobs.BlobClientOptions options, System.Text.Json.JsonSerializerOptions jsonSerializerOptions) &nbsp; &nbsp;Unknown&gt; &nbsp; &nbsp;MrMinute.dll!Program.&lt;Main&gt;$.AnonymousMethod__0_1(System.IServiceProvider sp) Line 47 &nbsp; &nbsp;C#&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(Microsoft.Extensions.DependencyInjection.ServiceLookup.FactoryCallSite factoryCallSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor&lt;Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, object&gt;.VisitCallSiteMain(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext argument) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor&lt;Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, object&gt;.VisitCallSite(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext argument) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(Microsoft.Extensions.DependencyInjection.ServiceLookup.ConstructorCallSite constructorCallSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor&lt;Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, object&gt;.VisitCallSiteMain(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext argument) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor&lt;Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, object&gt;.VisitCallSite(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext argument) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(Microsoft.Extensions.DependencyInjection.ServiceLookup.ConstructorCallSite constructorCallSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor&lt;Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, object&gt;.VisitCallSiteMain(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext argument) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitDisposeCache(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite transientCallSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor&lt;Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, object&gt;.VisitCallSite(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext argument) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceCallSite callSite, Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope scope) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.RealizeService.AnonymousMethod__0(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope scope) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceIdentifier serviceIdentifier, Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope serviceProviderEngineScope) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.dll!Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(System.Type serviceType) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.Abstractions.dll!Microsoft.Extensions.DependencyInjection.ActivatorUtilities.ConstructorInfoEx.GetService(System.IServiceProvider serviceProvider, int parameterIndex) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.Abstractions.dll!Microsoft.Extensions.DependencyInjection.ActivatorUtilities.ConstructorMatcher.CreateInstance(System.IServiceProvider provider) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Extensions.DependencyInjection.Abstractions.dll!Microsoft.Extensions.DependencyInjection.ActivatorUtilities.CreateInstance(System.IServiceProvider provider, System.Type instanceType, object[] parameters) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Core.dll!Microsoft.Azure.Functions.Worker.DefaultFunctionActivator.CreateInstance(System.Type instanceType, Microsoft.Azure.Functions.Worker.FunctionContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;MrMinute.dll!TeamsToDynamics.DirectFunctionExecutor.ExecuteAsync(Microsoft.Azure.Functions.Worker.FunctionContext context) Line 104 &nbsp; &nbsp;C#&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Core.dll!Microsoft.Azure.Functions.Worker.Pipeline.FunctionExecutionMiddleware.Invoke(Microsoft.Azure.Functions.Worker.FunctionContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Core.dll!Microsoft.Extensions.Hosting.MiddlewareWorkerApplicationBuilderExtensions.UseFunctionExecutionMiddleware.AnonymousMethod__1_2(Microsoft.Azure.Functions.Worker.FunctionContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Core.dll!Microsoft.Azure.Functions.Worker.OutputBindings.OutputBindingsMiddleware.Invoke(Microsoft.Azure.Functions.Worker.FunctionContext context, Microsoft.Azure.Functions.Worker.Middleware.FunctionExecutionDelegate next) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Core.dll!Microsoft.Extensions.Hosting.MiddlewareWorkerApplicationBuilderExtensions.UseOutputBindingsMiddleware.AnonymousMethod__3(Microsoft.Azure.Functions.Worker.FunctionContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.dll!Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.FunctionsHttpProxyingMiddleware.Invoke(Microsoft.Azure.Functions.Worker.FunctionContext context, Microsoft.Azure.Functions.Worker.Middleware.FunctionExecutionDelegate next) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Resuming Async Method] &nbsp; &nbsp;&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;System.Threading.Tasks.VoidTaskResult&gt;.AsyncStateMachineBox&lt;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.FunctionsHttpProxyingMiddleware.&lt;Invoke&gt;d__5&gt;.ExecutionContextCallback(object s) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;System.Threading.Tasks.VoidTaskResult&gt;.AsyncStateMachineBox&lt;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.FunctionsHttpProxyingMiddleware.&lt;Invoke&gt;d__5&gt;.MoveNext(System.Threading.Thread threadPoolThread) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;System.Threading.Tasks.VoidTaskResult&gt;.AsyncStateMachineBox&lt;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.FunctionsHttpProxyingMiddleware.&lt;Invoke&gt;d__5&gt;.MoveNext() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.TaskAwaiter.OutputWaitEtwEvents.AnonymousMethod__12_0(System.Action innerContinuation, System.Threading.Tasks.Task innerTask) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction(System.Action action, bool allowInlining) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.Task.RunContinuations(object continuationObject) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;Microsoft.AspNetCore.Http.HttpContext&gt;.SetResult(Microsoft.AspNetCore.Http.HttpContext result) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Completed] Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.dll!Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.DefaultHttpCoordinator.SetFunctionContextAsync(string invocationId, Microsoft.Azure.Functions.Worker.FunctionContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;System.__Canon&gt;.AsyncStateMachineBox&lt;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.DefaultHttpCoordinator.&lt;SetFunctionContextAsync&gt;d__7&gt;.ExecutionContextCallback(object s) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;Microsoft.AspNetCore.Http.HttpContext&gt;.AsyncStateMachineBox&lt;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.DefaultHttpCoordinator.&lt;SetFunctionContextAsync&gt;d__7&gt;.MoveNext(System.Threading.Thread threadPoolThread) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;System.__Canon&gt;.AsyncStateMachineBox&lt;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.DefaultHttpCoordinator.&lt;SetFunctionContextAsync&gt;d__7&gt;.MoveNext() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.TaskAwaiter.OutputWaitEtwEvents.AnonymousMethod__12_0(System.Action innerContinuation, System.Threading.Tasks.Task innerTask) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction(System.Action action, bool allowInlining) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.Task.RunContinuations(object continuationObject) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.Task&lt;bool&gt;.TrySetResult(bool result) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.Task.CancellationPromise&lt;bool&gt;.System.Threading.Tasks.ITaskCompletionAction.Invoke(System.Threading.Tasks.Task completingTask) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.Task.RunContinuations(object continuationObject) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.Task&lt;bool&gt;.TrySetResult(bool result) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.Tasks.TaskCompletionSource&lt;bool&gt;.SetResult(bool result) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.dll!Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.ContextReference.InvokeFunctionAsync() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.dll!Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.DefaultHttpCoordinator.RunFunctionInvocationAsync(string invocationId) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.dll!Microsoft.AspNetCore.Http.FunctionsHttpContextExtensions.InvokeFunctionAsync(Microsoft.AspNetCore.Http.HttpContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.dll!Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore.WorkerRequestServicesMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.AspNetCore.HostFiltering.dll!Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;Microsoft.AspNetCore.Server.Kestrel.Core.dll!Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests&lt;Microsoft.AspNetCore.Hosting.HostingApplication.Context&gt;(Microsoft.AspNetCore.Hosting.Server.IHttpApplication&lt;Microsoft.AspNetCore.Hosting.HostingApplication.Context&gt; application) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Resuming Async Method] &nbsp; &nbsp;&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;System.Threading.Tasks.VoidTaskResult&gt;.AsyncStateMachineBox&lt;Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.&lt;ProcessRequests&gt;d__238&lt;Microsoft.AspNetCore.Hosting.HostingApplication.Context&gt;&gt;.ExecutionContextCallback(object s) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(System.Threading.Thread threadPoolThread, System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;System.Threading.Tasks.VoidTaskResult&gt;.AsyncStateMachineBox&lt;Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.&lt;ProcessRequests&gt;d__238&lt;Microsoft.AspNetCore.Hosting.HostingApplication.Context&gt;&gt;.MoveNext(System.Threading.Thread threadPoolThread) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder&lt;System.Threading.Tasks.VoidTaskResult&gt;.AsyncStateMachineBox&lt;Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.&lt;ProcessRequests&gt;d__238&lt;System.__Canon&gt;&gt;.ExecuteFromThreadPool(System.Threading.Thread threadPoolThread) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.ThreadPoolWorkQueue.Dispatch() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;System.Private.CoreLib.dll!System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart() &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Async Call Stack] &nbsp; &nbsp;&nbsp; &nbsp; &nbsp;[Async] Microsoft.Azure.Functions.Worker.Core.dll!Microsoft.Azure.Functions.Worker.FunctionsApplication.InvokeFunctionAsync(Microsoft.Azure.Functions.Worker.FunctionContext context) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Async] Microsoft.Azure.Functions.Worker.Grpc.dll!Microsoft.Azure.Functions.Worker.Handlers.InvocationHandler.InvokeAsync(Microsoft.Azure.Functions.Worker.Grpc.Messages.InvocationRequest request) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Async] Microsoft.Azure.Functions.Worker.Grpc.dll!Microsoft.Azure.Functions.Worker.GrpcWorker.ProcessRequestCoreAsync(Microsoft.Azure.Functions.Worker.Grpc.Messages.StreamingMessage request) &nbsp; &nbsp;Unknown&nbsp; &nbsp; &nbsp;[Async] System.Private.CoreLib.dll!System.Threading.Tasks.Task.Run &nbsp; &nbsp;Unknown&nbsp;&nbsp;&nbsp;&nbsp;Thank you in advance for the assistance&nbsp;&nbsp;&nbsp;

nivedipa-msft · Answer

@LHowlin - Thanks for bringing this issue to our attention.
The crash occurs when the Agents SDK static initializer runs as DI constructs BlobsStorage within the Functions worker. This static initialization can trigger runtime or assembly behaviors—such as JSON/serializer/converter registration or reflection—that conflict with the Functions host or your dependency graph, resulting in the fatal CLR error you shared.
Immediate, high-value actions

Prevent early static initialization

Avoid instantiating Microsoft.Agents.Storage.Blobs.BlobsStorage during host startup or registration. Instead, register a factory or Lazy provider and create the instance only when first needed during function execution. This prevents the Agents SDK static constructor from running at DI build time.
Recommended approach: register a factory or lazy provider in Program.cs, then invoke the factory inside the function handler to keep DI registration lightweight.

Identify or confirm a compatibility issue

Test outside Functions: build a small console app referencing the same Agents packages and instantiate BlobsStorage to check for the same crash. If it fails, it's likely a library/runtime incompatibility; if not, the issue relates to Azure Functions startup.
Review transitive package versions for conflicts (e.g., System.Text.Json, runtime-targeting packages, Microsoft.NETCore.Targets). The Microsoft.NETCore.Targets package may be causing resolution issues.

If lazy initialization resolves the crash

Continue using the lazy-factory approach in production, as it is a reliable workaround until a library fix is released.

If lazy initialization does not resolve the crash

Gather runtime details to report a precise bug: include output from dotnet --info, a list of all resolved (transitive) packages, Functions host version, function app settings, exact package versions, and a memory dump or full stack trace. Attach a minimal repro that demonstrates the crash.

Ref Docs:

Azure Functions DI guidance (avoid resolving heavy services during startup): https://learn.microsoft.com/en-us/azure/azure-functions/functions-dotnet-dependency-injection#regis…
Isolated worker guidance for startup and configuration: https://learn.microsoft.com/en-us/azure/azure-functions/dotnet-isolated-process-guide#start-up-and-…
DI best practices (avoid heavy work/async in constructors, keep factories fast): https://learn.microsoft.com/en-us/dotnet/core/extensions/dependency-injection-guidelines#recommenda…
.NET dependency loading and assembly resolution reference (for version conflict investigation): https://learn.microsoft.com/en-us/dotnet/core/dependency-loading/overview
Thanks,&nbsp;
Nivedipa
---------------------------------------------------------------------------------------------------------------------&nbsp;
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Agents SDK Teams Bot crashes MSFT.Agents.Core.ProtocolJsonSerializer..cctor() with CLR (0x80131506)

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