Can't create a Gitlab account because it is "blocked"?

Hello, I’m not sure it’s the right place to asking for help but i’m unable to create a Gitlab account.

Some years ago I signed in with my GitHub account, and now when I try to do it again, I get this error :

What should I do ? If I try to create an account, it doesn’t let me use my Github account email because it “already exists”… :frowning: