Updating issues in Azure Digital Twins using Azure Functions for concurrent requests.

Question

Hello,

Advanced Apologies if I am repeating this Thread on Github

I am getting an issue when updating the Azure Digital Twins twin values using Managed Credential for Azure Function App.

When I restart the Function app, it works for about ~5-10 minutes but after I see a noticeable lag in the values being updated in Azure Digital Twins due to the Azure Function still 'Executing'. Please note: there are multiple events arriving to Azure Functions app all requiring to update something in Azure Digital Twins. After a while, I see these errors (see end of section).

For Azure Digital Twins client connection I am using this code (I know this is working because in the first 5 minutes it works as expected). System ManagedIdentity is enabled for Function App and added to ADT Data Owner role - I have seen values being updated in ADT.

var cred = new DefaultAzureCredential();
var client = new DigitalTwinsClient(new Uri(adtInstanceUrl), cred);

this steps below seems to be taking too long (and failing) after a while:
await client.UpdateDigitalTwinAsync(deviceId, updateTwinData);

Error in ingest function: ManagedIdentityCredential authentication failed: Retry failed after 4 tries. Retry settings can be adjusted in ClientOptions.Retry or by configuring a custom retry policy in ClientOptions.RetryPolicy. (The operation was cancelled because it exceeded the configured timeout of 0:01:40. Network timeout can be adjusted in ClientOptions.Retry.NetworkTimeout.) (The operation was cancelled because it exceeded the configured timeout of 0:01:40. Network timeout can be adjusted in ClientOptions.Retry.NetworkTimeout.) (The operation was cancelled because it exceeded the configured timeout of 0:01:40. Network timeout can be adjusted in ClientOptions.Retry.NetworkTimeout.) (The operation was cancelled because it exceeded the configured timeout of 0:01:40. Network timeout can be adjusted in ClientOptions.Retry.NetworkTimeout.)
See the troubleshooting guide for more information. https://aka.ms/azsdk/net/identity/managedidentitycredential/troubleshoot.

at Azure.Identity.CredentialDiagnosticScope.FailWrapAndThrow(Exception ex, String additionalMessage)
at Azure.Identity.ManagedIdentityCredential.GetTokenImplAsync(Boolean async, TokenRequestContext requestContext, CancellationToken cancellationToken)
at Azure.Identity.ManagedIdentityCredential.GetTokenAsync(TokenRequestContext requestContext, CancellationToken cancellationToken)
at Azure.Identity.DefaultAzureCredential.GetTokenFromSourcesAsync(TokenCredential[] sources, TokenRequestContext requestContext, Boolean async, CancellationToken cancellationToken)
at Azure.Identity.DefaultAzureCredential.GetTokenImplAsync(Boolean async, TokenRequestContext requestContext, CancellationToken cancellationToken)
at Azure.Identity.CredentialDiagnosticScope.FailWrapAndThrow(Exception ex, String additionalMessage)
at Azure.Identity.DefaultAzureCredential.GetTokenImplAsync(Boolean async, TokenRequestContext requestContext, CancellationToken cancellationToken)
at Azure.Identity.DefaultAzureCredential.GetTokenAsync(TokenRequestContext requestContext, CancellationToken cancellationToken)
at Azure.Core.Pipeline.BearerTokenAuthenticationPolicy.AccessTokenCache.GetHeaderValueFromCredentialAsync(TokenRequestContext context, Boolean async, CancellationToken cancellationToken)
at Azure.Core.Pipeline.BearerTokenAuthenticationPolicy.AccessTokenCache.GetHeaderValueAsync(HttpMessage message, TokenRequestContext context, Boolean async)
at Azure.Core.Pipeline.BearerTokenAuthenticationPolicy.AccessTokenCache.GetHeaderValueAsync(HttpMessage message, TokenRequestContext context, Boolean async)
at Azure.Core.Pipeline.BearerTokenAuthenticationPolicy.AuthenticateAndAuthorizeRequestAsync(HttpMessage message, TokenRequestContext context)
at Azure.Core.Pipeline.BearerTokenAuthenticationPolicy.ProcessAsync(HttpMessage message, ReadOnlyMemory1 pipeline, Boolean async) at Azure.DigitalTwins.Core.DigitalTwinsRestClient.UpdateAsync(String id, String patchDocument, UpdateDigitalTwinOptions digitalTwinsUpdateOptions, CancellationToken cancellationToken) at Azure.DigitalTwins.Core.DigitalTwinsClient.UpdateDigitalTwinAsync(String digitalTwinId, JsonPatchDocument jsonPatchDocument, Nullable1 ifMatch, CancellationToken cancellationToken)
at AzureFunction_IoTbridgeADT.ProcessHubToDTEvents.Run(EventGridEvent eventGridEvent, ILogger log) in C:\Users\XXXXX\FunctionFolder\Function1.