Internal CNAME pointing to my proxied domain at Cloudflare

We got a client trying to use a custom CNAME inside their structure (internal DNS) pointing to our site, but they receive the error 1001.
I asked him to add their zone to Cloudflare, they did it then they got the error ERR_SSL_VERSION_OR_CIPHER_MISMATCH.
Is there a way to make it work? How can we do that?


That cipher mismatch error is usually a timing issue

What is the domain?

Screenshot 2023-02-27 at 12.57.32 PM

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