Hi,
did you checked already if the relevant Docker instances are up- and running?
e.g.:
univention-app status owncloud -> should give you
App is running
docker ps -a -> should give you:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d94338f18509 docker.software-univention.de/owncloud-owncloud:10.2.1-1 "/usr/bin/entrypoint…" 7 weeks ago Up 2 weeks 0.0.0.0:40007->8080/tcp owncloud_owncloud_1
ba8b3af96102 docker.software-univention.de/owncloud-redis:10.2.1-1 "/usr/bin/entrypoint…" 7 weeks ago Up 2 weeks 6379/tcp owncloud_redis_1
If the relevant containers are up- and running you can check the according logs with this command: univention-app logs owncloud