In case you have a SPRINGFIELD Domain account, you can login using the Domain credentials on the Domain login page:

• Springfield Domain User

Other users might use the default login page:

• Standard

Welcome at tobi.backfrak.de GitLab

You may want to take a look at the instance specific help pages user section: https://homer.tobi.backfrak.de/pages/springfiled-docs/gitlab-user-docs/Index/index.html#users