There is an issue right now that is causing custom domains to not work. The team is looking into this now. We will post an update once this is fixed.
This issue that was affecting our connection to our custom domain partners fly.io has now been fixed. Custom domains that are connected to Glitch projects should be working. If you are seeing otherwise, please send us a message.
I also wanted to let you know that the team here is looking at ways to improve the custom domain feature. While I can’t give an ETA on when anything will be updated, please know that we feel your frustrations and are working towards improvements.