@Shawn Martin
Yes, we have had the same issue in out test environment.
To fix this issue you need to create an accepted domain !
Rgds
Nico
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Is anyone else having a problem in OWA opening other mailboxes when the default SMTP address is not an address that's the default domain? I can fix this issue by changing the default SMTP address of the mailbox, but this is not an optimal solution.
Thanks
Exception
Exception type: System.ArgumentNullException
Exception message: Value cannot be null. Parameter name: organizationId
Call stack
Microsoft.Exchange.Data.Directory.ScopeSet.GetOrgWideDefaultScopeSet(OrganizationId organizationId, QueryFilter recipientReadFilter)
Microsoft.Exchange.Data.Directory.ADSessionSettings.FromOrganizationIdWithoutRbacScopesServiceOnly(OrganizationId scopingOrganizationId)
Microsoft.Exchange.Clients.Owa.Core.Utilities.CreateADRecipientSession(Boolean readOnly, ConsistencyMode consistencyMode, SmtpDomain smtpDomain)
Microsoft.Exchange.Clients.Owa.Core.OwaMiniRecipientIdentity.UpgradePartialIdentity()
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.PrepareRequestWithoutSession(OwaContext owaContext, UserContextCookie userContextCookie)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.AcquireAndPreprocessUserContext(OwaContext owaContext, HttpRequest request)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.InternalDispatchRequest(OwaContext owaContext)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DispatchRequest(OwaContext owaContext)
Microsoft.Exchange.Clients.Owa.Core.OwaRequestEventInspector.OnPostAuthorizeRequest(Object sender, EventArgs e)
System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)