proxied domains can't be pointed to

So I've got a cloudflare pages site accessed through a domain that's proxied through cloudflare's dns server thingies. And if I try to point another domain to that pages site, i get a 522 status code, despite that original cloudflare pages site being online and accessible through the original domain.

I've made a sort-of diagram showing what works and what doesn't.
2.domain -> 1.domain ( returns 522 )
1.domain -> cloudflare -> pages site ( works fine )
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