Troubleshoot browserstack-sdk installation failure in App Automate

How do I resolve “Tool ‘browserstack-sdk’ failed to install.“ during Project Build with BrowserStack TestAdapter?

If you get Tool 'browserstack-sdk' failed to install. error during project build with BrowserStack TestAdapter, here are the possible reasons:

• You did not enable the nuget source for .NET. To check this, run dotnet nuget list source and see if this entry is missing or disabled.

  To add nuget, run dotnet nuget add source https://api.nuget.org/v3/index.json --name nuget.org.

  To enable nuget, run dotnet nuget enable source "nuget.org".

• You are behind a proxy. To fix this, install dotnet new tool-manifest and dotnet tool install dotnetsay --version 2.1.3.

  If this fails, add proxy to nuget.