artifacts-credprovider: "A task was canceled" exception with CredentialProvider.Microsoft.exe v0.1.15

Our AzureDevOps build pipeline continues to see “System.Threading.Tasks.TaskCanceledException: A task was canceled.” exceptions during NuGet restore, similar to #77, but we have version 0.1.15 that contains the fix for that issue.

We are using NuGet.exe v4.9.4 on AzureDevOps, installed using the NuGetToolInstaller@0 and performing a Restore using NuGetCommand@2, v2.150.0.

From the build logs, here’s the NuGet.exe invocation:

Detected NuGet version 4.9.4.5839 / 4.9.4+ed6e2dca9391d13b431f4eff58c5194f0ebcee13
SYSTEMVSSCONNECTION exists true
[command]C:\BA\_tool\NuGet\4.9.4\x64\nuget.exe restore "C:\BA\8139\s\SpatialServices\SpatialServices API - Windows.sln" -Verbosity Detailed -NonInteractive -ConfigFile C:\BA\8139\s\SpatialServices\nuget.config
NuGet Version: 4.9.4.5839
MSBuild auto-detection: using msbuild version '15.9.21.664' from 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\bin'. Use option -MSBuildVersion to force nuget to use a specific version of MSBuild.

Here’s the output from the CredentialProvider.Microsoft.exe showing version information:

Using C:\BA\_tasks\NuGetCommand_333b11bd-d341-40d9-afcf-b32d5ce6f23b\2.150.0\CredentialProviderV2\plugins\netfx\CredentialProvider.Microsoft\CredentialProvider.Microsoft.exe as a credential provider plugin.
    [CredentialProvider.175929]Time elapsed in milliseconds after sending response 'Request' 'GetOperationClaims': 28
    [CredentialProvider.175929]Running in plug-in mode
    [CredentialProvider.175929]Handling 'Request' 'Initialize'. Time elapsed in ms: 7 - Payload: {"ClientVersion":"4.9.4","Culture":"en-US","RequestTimeout":"00:00:05"}
    [CredentialProvider.175929]Time elapsed in milliseconds after sending response 'Request' 'Initialize': 10
    [CredentialProvider.175929]Sending response: 'Request' 'Initialize'. Time elapsed in ms: 9
    [CredentialProvider.175929]Command-line v0.1.15: "C:\BA\_tasks\NuGetCommand_333b11bd-d341-40d9-afcf-b32d5ce6f23b\2.150.0\CredentialProviderV2\plugins\netfx\CredentialProvider.Microsoft\CredentialProvider.Microsoft.exe" -Plugin
    [CredentialProvider.175929]Handling 'Request' 'GetOperationClaims'. Time elapsed in ms: 1 - Payload: {}
    [CredentialProvider.175929]Sending response: 'Request' 'GetOperationClaims'. Time elapsed in ms: 12
    [CredentialProvider.175929]Handling 'Request' 'SetLogLevel'. Time elapsed in ms: 1 - Payload: {"LogLevel":"Debug"}
    [CredentialProvider]Sending response: 'Request' 'SetLogLevel'. Time elapsed in ms: 3
    [CredentialProvider]Time elapsed in milliseconds after sending response 'Request' 'SetLogLevel': 6

And the unhandled exception that fails builds:

Unhandled Exception: System.Threading.Tasks.TaskCanceledException: A task was canceled.
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.Protocol.Plugins.MessageDispatcher.<DispatchWithNewContextAsync>d__26`2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.Protocol.Plugins.SymmetricHandshake.<HandshakeAsync>d__14.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.Protocol.Plugins.Connection.<ConnectAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.Protocol.Plugins.PluginFactory.<CreateFromCurrentProcessAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGetCredentialProvider.Program.<Main>d__11.MoveNext() in E:\A\_work\616\s\CredentialProvider.Microsoft\Program.cs:line 133
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGetCredentialProvider.Program.<Main>(String[] args)