The domain which you have entered belongs to a different deployment/region

The domain which you have entered belongs to a different deployment/region

Hello, I'm getting the error "The domain which you have entered belongs to a different deployment/region" when trying to host email with my domain www.agenciaquack.com

I need help, as I already did 3 other replies and 1 other post on this forum and everyone of them is still "waiting for moderation". My emails got no answer, as well.