I may have lost access to my GitLab account. I have no idea what happened.
When I tried to log in, I was immediately redirected to an error page saying "422 Sign-in using Wikimedia Dev Account (OIDC) auth failed: Email has already been taken."
In T337598 another user had encountered the same error, but that was because he just changed his username. I did not do such a thing.
Wikitech user information
Username: MilkyDefer
Shell: milkydefer
Email: No email set
GitLab user information
Username: MilkyDefer
User ID: 536