You have bought your domain name on AppDrag correctly but it's not associated with any AppDrag's project.
How to fix?
In the Appdrag's Dashboard > click on your first name in the top right corner > Click on 'My Domains' > Click on the the settings icon, Click on Move domain to AppID.
You have configured your CNAME redirection to AppDrag correctly but it's not associated with any AppDrag's project.
You must register you domain name in the Appdrag's Dashboard > Your app > Settings > Domain > use an existing domain name registered with another registrar
Do you need help to configure your domain?