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[BUG] Unexpected type for header

See original GitHub issue

Library name and version

Azure.Core 1.29.0

Describe the bug

After upgrading to Azure.Core 1.29.0 (required by Microsoft.Extensions.Azure 1.6.2) we repeatedly receive this error:

System.InvalidOperationException: Unexpected type for header : 
 at Azure.Core.Pipeline.HttpClientTransport.PipelineRequest.GetHttpHeaderValue(String headerName, Object value)
 at Azure.Core.Pipeline.HttpClientTransport.PipelineRequest.EnumerateHeaders()+MoveNext()
 at Azure.Core.Diagnostics.AzureCoreEventSource.FormatHeaders(IEnumerable`1 headers, HttpMessageSanitizer sanitizer)
 at Azure.Core.Diagnostics.AzureCoreEventSource.Request(Request request, String assemblyName, HttpMessageSanitizer sanitizer)\n at Azure.Core.Pipeline.LoggingPolicy.ProcessAsync(HttpMessage message, ReadOnlyMemory`1 pipeline, Boolean async)
 at Azure.Core.Pipeline.BearerTokenAuthenticationPolicy.ProcessAsync(HttpMessage message, ReadOnlyMemory`1 pipeline, Boolean async)
 at Azure.Core.Pipeline.RedirectPolicy.ProcessAsync(HttpMessage message, ReadOnlyMemory`1 pipeline, Boolean async)\n at Azure.Core.Pipeline.RetryPolicy.ProcessAsync(HttpMessage message, ReadOnlyMemory`1 pipeline, Boolean async)
 at Azure.Core.Pipeline.RetryPolicy.ProcessAsync(HttpMessage message, ReadOnlyMemory`1 pipeline, Boolean async)
 at Azure.Core.Pipeline.HttpPipeline.SendRequestAsync(Request request, CancellationToken cancellationToken)
 at Azure.Messaging.ServiceBus.Administration.HttpRequestAndResponse.SendHttpRequestAsync(Request request, CancellationToken cancellationToken)\n at Azure.Messaging.ServiceBus.Administration.HttpRequestAndResponse.GetEntityAsync(String entityPath, String query, Boolean enrich, CancellationToken cancellationToken)
 at Azure.Messaging.ServiceBus.Administration.ServiceBusAdministrationClient.GetQueueAsync(String name, CancellationToken cancellationToken)

This does not happen locally. It only occurs when running in a container in AKS using managed identity credentials. Downgrading to Azure.Core 1.28.0 and Microsoft.Extensions.Azure 1.6.0 solves the issue. If it helps we’re using Azure.Messaging.ServiceBus 7.12.0.