Custom domain redirects but show instructions, not my project

My domain registrar is Google. I added a subdomain forward to http://glitch.edgeapp.net

with these (default) options:

  • Temporary redirect (302)
  • Do not forward path
  • Disable SSL

When I point my browser at my domain I see the URL has been redirected to glitch.edgeapp.net, but instead of displaying my web page:

Hello World! This starter gives you everything you need to start working on a new website, and nothing more.

it displays:

Setting up a custom domain for your Glitch project?
Go here for instructions!

Sounds like you added a synthetic record when you actually needed a CNAME record.

In the Google Domains DNS tab, delete your Subdomain forward entry and at the bottom in the Custom resource records panel create a CNAME record pointing your subdomain to glitch.edgeapp.net: