GIT Fatal error: Authentication failed in Visual Studio

Question

As of today I'm getting errors when trying to use git commands with my repository in Azure-DevOps. The repositories sit in a project on DevOps that I can access with the same account and shows no sign of any recent changes to it. The steps I can take to reproduce it is:

1. Open the command prompt and enter git fetch
2. A window appears prompting for a login
3. I click the account
4. No password is prompted, but an e-mail arrives that a PAT has been created
5. The command prompt yields an error

Error:

fatal: Authentication failed for `<link to repository>`

Things I've tried so far:

• Restarting PC
• Signing out and in on Visual Studio
• Removing the .IdentityService folder
• Removing and installing GIT
• Removing and installing GIT For Windows in the Visual Studio Installer
• Removing the cache folder %LOCALAPPDATA%\Microsoft\Team Foundation\7.0\Cache
• Removing the cache folder %LOCALAPPDATA%\Microsoft\Team Foundation\8.0\Cache
• Removing GIT and VS keys from the Credential Manager
• Quite a few other things 'fixes' found online that did not solve my issue

Currently running:

• GIT 2.21.0-64 bit
• Visual Studio 2019

Edit:

I've attempted using Visual Studio Code with the Azure Repos 1.149.2 extension and get the same error. It yields me the Microsoft page to enter my code for device login which it grants, but using git commands give me the same error messages.

I've also had my profile removed from the Azure DevOps environment and re-added without success.

Answer 1

In my particular case after many mails back and forth with Microsoft it turned out that two of my accounts somehow started conflicting with eachother causing weird errors. A nice example was that making changes to a wiki in DevOps would show a different account in the commit trial than the account I was logged into.

In the end Microsoft managed to fix it and I haven't had any issues since.