Adaptive Card not sending data on iOS Teams app

Sayali-MSFT 

I'm on iOS 15.3.1

protected override async Task<InvokeResponse> OnInvokeActivityAsync(ITurnContext<IInvokeActivity> turnContext, CancellationToken cancellationToken)
        {
            if (turnContext.Activity.Name == "adaptiveCard/action")
            {
                await turnContext.SendActivityAsync(new Activity { Type = ActivityTypes.Typing }, cancellationToken);
                ChatActivities chat = new ChatActivities(this._appId, this._appPassword);
                KeyVaultHelper keyVault = new KeyVaultHelper();
                TableStorageHelper table = new TableStorageHelper(keyVault, turnContext.Activity.Conversation.TenantId);

                
                dynamic request = turnContext.Activity.Value;
                string comment = (request.action.data.InputComment == null) ? "" : request.action.data.InputComment;

The last line (12) is the one where it crashes because request.action.data is null. (Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: Cannot perform runtime binding on a null reference). It is always null when sent from the iOS app, if I type in a comment or leave the field empty. It's also independent of the action button I'm using.