Using Cloudflare redirect (Page Rules) for subdomain only, external nameservers

For a customer project we are investigating some technical features.
In a first step we would like to create a redirect (Page Rules) for a subdomain. The domain is hosted on external dns. I added the following CNAME there:
subdomain.mydomain.tld CNAME

It’s not working. Is there anything I am missing/making wrong?

BR, Jens

To make use of the Cloudflare features, the domain must be registered with Cloudflare.
Protecting an external Domain with just a CNAME isn’t possible.

Thank you!
Indeed - adding a corresponding CNAME in Cloudflare DNS setup solves the matter (even if this CNAME there is not working because page rules-redirect will overwrite this).

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