MTLS not working with external CNAME

I have a cname that points to a service at digital ocean app platform, basically im pointing my CNAME to their dns.
This cname is proxied.

Them I created a TLS certificate and added the HOST to create the MTLS.

I noticed that this certificate is not working doesn’t matter what I do.
It’s working fine in another A domain that I fully control, but when I use a cname it does not work always get a 403 blocked.

Why does this happen ?

If you’re still encountering this, can you share the name of the website?

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