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Cloudflare SSL certificate not cover www.sub.domain.com

I have a website (prototype website for the lab where I am the research assistant). It is under chenpan.xyz, and I deployed an SSL certificate for www.sub.chenpan.xyz (I am a WWW friend now!).

Like my other websites, I enabled Cloudflare for it. But it stopped working! I got the following error from the browser:

This site can’t provide a secure connection.

www.sub.chenpan.xyz uses an unsupported protocol.

ERR_SSL_VERSION_OR_CIPHER_MISMATCH