I had the same issue when using the git cli and sourcetree – and doing the below solved it.

This is basically an auth issue and git had stored my creds for both bitbucket and github. All I had to do was delete those saved entries using sourcetree.

I am using SourceTree, so went to Tools -> Options -> Authentication

and under git saved passwords, I deleted them all.

This post can lead to other ways of doing the same as well.

Remove credentials from Git:

If this problem comes on a Windows machine, do the following.

• Go to Credential Manager
  • in German, it is called: Anmeldeinformationsverwaltung
  • in French, it is called: Gestionnaire d’identification
  • in Polish, it is called: Menedżer poświadczeń
  • in Portuguese, it is called: Gerenciador de Credenciais
  • in Russian, it is called: Диспетчер учётных данных
  • in Spanish, it is called: Administrador de credenciales
  • Go to Windows Credentials
  • Delete the entries under Generic Credentials
  • Try connecting again. This time, it should prompt you for the correct username and password.