CNAME point to Cloudflare from another dns provided (name server) lead to Error 1000: DNS points to prohibited IP

Hello all, if anyone encounter Error 1000: DNS points to prohibited IP for the below case?

I got 2 domain with 2 DNS management provider

there are 2 CNAME record in cloudflare (maindomain)
CNAME www -> devdomain.com
CNAME www-fallback -> realcontent.com

In aliyun console, there are 2 CNAME record (devdomain):
CNAME @ realcontent.com (default)
CNAME @ www-fallback.maindomain.com (specific country region)

But I always got Error 1000: DNS points to prohibited IP for the specific country region

Anyone knows if I doing in the correct way and how to fix it?

Thanks

Likely some loop where you have a CNAME at Cloudflare pointing to a CNAME outside Cloudflare that points back to a Cloudlfare IP address.

Can you give the real domain and hostname you have a problem with, then it can be checked.

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