Www.subdomain.domain.com not working

Suddenly www.subdomain.domain.com stopped working while subdomain.domain.com works fine.

Any idea?

Is it using the Cloudflare proxy? If so, are you using the Advanced Certificate?

Checked with and without proxy. Same thing.
It refers to a WIX website.

What is advanced certificate?

If you are using “DNS only” with a Wix website, then you’ll need to check with them if you are having issues.

www.subdomain.domain.com won’t work with the proxy and Cloudflare’s Universal SSL (which only cover the domain and first-level subdomain), an Advanced certificate is needed for deeper subdomains…

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