Custom Domains - Site apparantly registered for glitch when it isn't

I was using custom domain on one of my projects, tmobile. But, I archived it so I can create a new project with node.js. (I copied code from old project). When I was trying to add mobile.tetretalk.com as custom domain to my new project, it wouldn’t work. It says “mobile.tetretalk.com is already registered for glitch”, when it isn’t anymore. I removed the CNAME and it still errors.

Custom Domain: mobile.tetretalk.com
Old Project (Archived & Was Private): tmobile
New Project (Private) tetretalkmobile

Email support@glitch.com.