I would recommend following possible solutions to this issue:
- Clearing Visual Studio credentials.
Type "Credential Manager" to the bottom search bar. Choose Windows credentials. Delete GitHub for Visual Studio credentials. After that, open Visual Studio and sign in again.
If this won't work. Try to delete all credentials that are related to Github and reopen Visual Studio.
- Reinstalling the Github-Copilot extension.
Open Visual Studio Installer. At the right of you installed Visual Studio tool click on "Modify". Choose "Individual components". Type in the search bar "Github Copilot" and unbox the option. After that, click "modify". At last, when extention is uninstall, repeat the process by installing it again.
- Check Personal Access Token status.
If you chose PAT option to sign in into Github account in Visual Studio, check if it is expired.
In one way or another, try to use new PAT to sign in.
Please add logs content to clarify the details. Perhaps it can help investigate the cause of the issue.