Subdomain "can't connect to the server"

My main domain was briefly down after installing Cloudflare but changing from ‘flexible’ to ‘full’ resolved that issue.

However my subdomain is still down and I’m getting this error:
Firefox → Hmm. We’re having trouble finding that site.
Chrome → # This site can’t be reached, server IP address could not be found.

I suspect part of the issue is that the subdomain is on a different webhost with different nameservers.

I’m still new to this aspect of web hosting so if the resolution is technical please dumb it down :slight_smile:

What are the names of the domain & subdomain?

Thank you so much for your offer of help. I was able to figure out the problem - it was an A name issue on Cloudflare, the subdomains needed an IP to direct to.