I have a domain name attached to Cloudflare with SSL(Full strict).
foo.domain.com is okay. But
example.foo.domain.com can’t be accessed normally.
I reconfirmed that the SSL certificate of the source station is normal and can be accessed normally when the CDN is not used. But as long as I use CDN, there will be an error message:
In other words, all third-level domain names using CDN cannot be accessed normally. Do you need additional conditions (e.g. payment) or settings for normal access?