William Salmon created an issue:
The current version of our gitlab GitLab Community Edition 12.9.0
as reported by https://gitlab.gnome.org/help
seems to be affected by https://gitlab.com/gitlab-org/gitlab/-/issues/212178 as i cant log in with my newly added ssh key, but i can with ldap via https
I believe this has been fixed in the 12.9.1 point release