SSL Not working with Ionos

Hey, i am experiencing this problem on my site: I have an SSL installed on ionos and on Cloudflare, I cannot figure out how to make the site work as I have an error 526.

First of all, you should not be using Full, but Full (strict).

Second: The site is working for me now. Did you fix the problem, or did you switch to to the Flexible setting? This would only disable encryption.

In case the problem is not yet fixed, you need to install a certificate for the name
Your existing certificate covers only subdomains like
Because of this, your server did probably not offer a certificate at all when a request to was made, hence the SSL error even on Full.