Incomprehensible error message when attempting to sign into Gnome Gitlab using Gitlab.com account
I was attempting to sign into the Gnome Gitlab account to report a bug at https://gitlab.gnome.org/users/sign_in
I clicked on the button to sign in with "Gitlab.com". I then signed in. Upon returning to the Gnome Gitlab page I was presented with the following error:
Signing in using your GitLab.com account without a pre-existing GitLab account is not allowed. Create a GitLab account first, and then connect it to your GitLab.com account.
Screenshot is attached. What does this mean??