Pages multi-level subdomain warning

I can successfully create a custom multi-level subdomain (x . y . example . com) for a pages site. However, I get a warning on the DNS CNAME entry that “This hostname is not covered by a certificate.”, even though it was issued a valid certificate and I get no errors when visiting the custom multi-level subdomain. Even though this is working, I want to know if this is a supported configuration or if it will break at some point in the future.

That’s an interesting warning. Custom Domains for Pages.dev and Workers.dev are custom hostnames, so they’re not Certificates in your account.

You’re fine. It’s not going to break due to that warning.

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