Fix git authentication issue

Description of the issue:

Any git command that communicates with the remote repository is suddenly failing and you are getting "fatal authentication failed" error.

How to fix?

In Windows environment:

Click Start

Type: Credential Manager (On Windows 10, this is under "Start->Settings". Then search for "Credential Manager"

 Open the app, click on the Windows Credentials tab

 Locate the credentials that you want to remove/update, they will start with "git:"

 

Click on the credential entry, it will open a details view of the entry.

Click Edit or Remove as required and confirm. 

Try again issue should be gone.