univention-app shell nextcloud sudo -u www-data php /var/www/html/occ config:system:get trusted_domains
that would give you for e.g.
ucs.internal.domain
192.168.60.6
as the list in config.php starts with position 0 (zero) you’ll get entry numbers 0-1 so you have to add new entry with id 2
univention-app shell nextcloud sudo -u www-data php /var/www/html/occ config:system:set trusted_domains 2 --value ucs.mydomain.com
also see: Edit config php for trust domain. what is the command? what is the path? - #2 by ahrnke
rg
Christian