Is it possible that it is stuck for 3 days?
For about one month, we use subdomain.example.com that is a CNAME to subdomain.pages.dev (it was configured automatically by Cloudflare when we added the subdomain to the page) and it worked perfectly.
Last Friday we tried to add another page, then use subdomain2.example.com as an alias for subdomain2.pages.dev but it doesn’t work. subdomain2.pages.dev works but subdomain2.example.com returns “Connection timed out Error code 522”. In the CF dashboard, the custom domains tab always show the “Verifying” status.