In terms of the certificate, Nethserver is built around the assumption that you’ll only have one. That means that any domain name you want to use needs to be on that one cert. That’s easy enough to do–you can have up to 100 names on a single Let’s Encrypt cert–but that’s the way you need to do it. And then that default cert will apply to Nextcloud and just about anything else. As Markus says, get rid of the virtual host entry for Nextcloud.
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