Gitlab.com "Domain taken" issue

I have an issue with gitlab.com pages, i had a project then i created a page with my own domain. After a while i deleted the project, create another one and tried to use the same domain, but gitlab says “Domain already taken”.

There’s no trace of the old project or page. does anyone has this problem? i googled and found little or nothing about it.

I’m not sure where to put this topic.

Any help will do thanks!