I’m still getiing the dreaded "You are accessing the server from an untrusted domain.” message. eventhough i added my own ddns redirector manually to the trusted_domains array in /var/lib/univention-appcenter/apps/nexcloud/conf/config/config.php
We had the same problem. Seems like /var/lib/univention-appcenter/apps/nexcloud/conf/config/config.php is not the file Nextcloud uses. After editing we just copied this file to the correct location using the commands below: