Can not login to Github Copilot in VisualStudio running with administrator rights

Question

I have a Github Copilot, and I would like to login into Github account to be able to use it with my Visual Studio 2022.
I can do it when VisualStudio started with usual user. But when it started with administrator rights (I need it to be run with admin rights due to the development I am doing), I am not able to login with Github.
When I press "Sign in to use Copilot", web page opened, I logged in, and then it opens the command prompt with GitHubProtocolHandler.exe. It hangs opened, but nothing happens.
When the same done on VisualStudio running as usual user - everything fine, I logged in successfully, copilot works.

After failed attempt a couple of times VS asked if I want to send a feedback report. But Visual Studio Feedback Tool also does not work with VisualStudio running as admin user! It opens the web browser page, but nothing happens. (Can not reproduce, so that is how I remember it)

Also I found in GitHubProtocolHandler.log next:

11/04/2025 09:14:03, Local | ERR | Error during setup: System.IO.IOException: All pipe instances are busy. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.Pipes.NamedPipeServerStream.Create(String fullPipeName, PipeDirection direction, Int32 maxNumberOfServerInstances, PipeTransmissionMode transmissionMode, PipeOptions options, Int32 inBufferSize, Int32 outBufferSize, PipeAccessRights rights, SECURITY_ATTRIBUTES secAttrs) at System.IO.Pipes.NamedPipeServerStream..ctor(String pipeName, PipeDirection direction, Int32 maxNumberOfServerInstances, PipeTransmissionMode transmissionMode, PipeOptions options, Int32 inBufferSize, Int32 outBufferSize, PipeSecurity pipeSecurity, HandleInheritability inheritability, PipeAccessRights additionalAccessRights) at System.IO.Pipes.NamedPipeServerStream..ctor(String pipeName, PipeDirection direction, Int32 maxNumberOfServerInstances, PipeTransmissionMode transmissionMode, PipeOptions options, Int32 inBufferSize, Int32 outBufferSize, PipeSecurity pipeSecurity) at Program.<Main>d__1.MoveNext()

And for admin user found 1A10C6F7-GithubCredentialStoreService-33088-ixusqmud-1.log:

04/11/2025 10:12:36 FLE Standard Time: Error : 733 :Credentials not found for key types: vsUserSpecificGitPrefix, userSpecificGitPrefix.

I tried to uninstall Copilot, and install it back using Microsoft Visual Studio Installer.
I tried to remove Github Windows credentials and relogin.
Nothing helped. The problems stays.

Any suggestions how to fix the problem?

My Visual Studio version is Microsoft Visual Studio Enterprise 2022 (64-bit) - Current, Version 17.13.6