Trusted Domains in Nextcloud ESX appliance

So my Problem is that when I try access Nextcloud with the IP-Addresse, the alert ā€œNo trusted Domainā€ shows up. I already went through multiple articels about that problem and added the Domain IP-Address as shown in these articels:

ā€˜trusted_domainsā€™ =>
array (
0 => ā€˜cloud.mer.localā€™,
1 => ā€˜10.0.0.15ā€™,
),

One Thing that seems a bit strange to me is that in the documentation I found, they said that I should find my config.php file in this path:
/var/lib/univention-appcenter/apps/nexctcloud/conf/config/config.php

but my config.php file was actually in this path:
/var/lib/univention-appcenter/apps/nexctcloud/data/integration/config/config.php

I didnā€™t configured a SSL Certificate by now and Iā€™am not sure if this could have a impact, but I donā€™t think so.