One of the most probable reason would be, your password is locked.
git failed with a fatal error. authentication failed for 'https //bitbucket
Solution for bitbucket auth error
- Step #1: Go to https://bitbucket.org
- Step #2: Login with your credentials
- Step #3: Solve the captcha if asked
- Step #4: Change the password after login (optional, but recommended)
- Step #5: Now, try again from your Git client (use the new password if you had changed it)