Trusted Domains in Nextcloud ESX appliance

So my Problem is that when I try access Nextcloud with the IP-Addresse, the alert “No trusted Domain” shows up. I already went through multiple articels about that problem and added the Domain IP-Address as shown in these articels:

‘trusted_domains’ =>
array (
0 => ‘cloud.mer.local’,
1 => ‘10.0.0.15’,
),

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 didn’t configured a SSL Certificate by now and I’am not sure if this could have a impact, but I don’t think so.