Using Git Credential Manager to authenticate git operations may end up with this error:

remote: Invalid username or password. If you log in via a third party service you must ensure you have an account password set in your account profile.
fatal: Authentication failed for 'https://xxxxxx@bitbucket.org/xxxxxxx/xxxxxxx.git/'

Should be related to the current ongoing authentication issue: https://status.bitbucket.org/incidents/3mx8kzzx9trf

Workaround 1: Disable Git Credential Manager by going to your git config file and remove this line "helper = manager" so that it is no longer registered as a credential helper.

Workaround 2: Use SSH instead of HTTPS to avoid HTTPS authentication.