SourceTree: Authentification pass but still ask for ID/password

I authenticate my cloud account in source tree by refreshing the OAuth token, and I receive the message that "Authentification OK" with a green check mark.

Then I go to fetch or push to the repo, and it asks me again the ID/PW. Even though I provide the ID/PW, it just keeps asking again and again without ever letting me push/fetch from the remote.

This bug renders source tree completely unusable.