SSL for domain works but not for sub-domain

I am running one Ubuntu server LAMP stack, with cerbot for letsencrypt. My domain shows as secure on Edge, Firefox and Chrome, but my subdomain works with Edge and Firewall (Secure) but with Chrome I get:
image

sslshopper shows:
Can’t post second image cause I’m new, but its all green checks.

In Cloudflare settings I have tried:
Off - none of the domains work
Flexible - none of the domains work
Full - root domain works, sub does not
Full (Strict) root domain works, sub does not

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