TLS Full mode with Custom Hostname not working (SSL error)

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What is the domain name?
I have a custom hostname like: foo.example.com I’ve registered example.com as a custom hostname and it works when in TLS Flex mode. When I enable Full or Strict mode I get an SSL error, since the origin certificate (issues by Cloudflare) on my origin servers only cover my domain (not example.com)

Since you can’t issue a certificate for a domain outsize of your zone, how are you supposed to set up TLS Full or Strict mode when use Custom Hostnames?

When you tested your domain, what were the results?
SSL error (works in flex mode)

You can use something like Let’s Encrypt to get an SSL certificate for the other hostname.

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