Domain Already Regristred

Hi i was usin in another proyect my custom domain ( and now i deleted the proyect and when i put the same domain (in the new proyect) its telling me is already registered for glitch

So plz help

Note: the proyect is:

Hi @RoboticObsession!
Welcome to the Glitch community - we’re sorry you are having issues with custom domains today. Could you email with the same info so they can remove the domain from their systems so you can use it again?