Can't set up my .tk .ml domains in Cloudflare Pages

I got an error of An unknown error occurred (Code: 8000000).

I tested .com .xyz … they worked fine.

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I also encountered the same problem

Whether it is the main domain of wr0926.ml or its subdomains, or other main domains I own, an error will be reported

Cloudflare has known limits to free TLDs like .cf, .ga, .gq, .ml and .tk. Your best bet is to upgrade to Pro plan or bring another domain in.