VisualStudio credential fails with Object reference not set to an instance of an object

[Informational] Azure-Identity: VisualStudioCredential.GetToken was unable to retrieve an access token. Scopes: [ https://vault.azure.net/.default ] ParentRequestId: 09a26f89-ff23-4fca-8463-c20a1824836a Exception: Azure.Identity.CredentialUnavailableException (0x80131500): Process "C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\Common7\IDE\Extensions\jzg2mnem.m2i\TokenService\Microsoft.Asal.TokenService.exe" has failed with unexpected error: TS003: Error, Object reference not set to an instance of an object..
 ---> System.InvalidOperationException (0x80131509): TS003: Error, Object reference not set to an instance of an object.

cc @schaabs @christothes

[crmann1]

Please look at the work around in the developer community post https://developercommunity2.visualstudio.com/t/Running-Azure-dependent-API-locally-fail/1330468

If you go to %localappdata%.IdentityService\AzureServiceAuth\tokenprovider.json and look in there, there is a path to an exe file. Beside the exe file is a .config file Edit the .config file in an administrator command prompt and add the following under the runtime tag.

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
  <dependentAssembly>
    <assemblyIdentity name="Microsoft.VisualStudio.Validation" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-16.8.0.0" newVersion="16.8.0.0" />
  </dependentAssembly>
</assemblyBinding>

We are looking at correcting this in 16.9 preview 5

[MatthewSteeples]

I’m experiencing this as well. VS 16.9 preview 4