Support for password authentication was removed on August 13, 2021. Please use a personal access token instead

Even though I create a PET in GitHub, and I set it in Sourcetree, it does get user, or updated.

Cloning a repo will result the same issue. Why? Should I remove the cache, or what?

Solution

Remove credentials, but not from Keychain as they are not stored there, but from filesystem, as written here:

home directory > Library > Application Support > Sourcetree