selfhosted-traefik/nextcloud/README.md

There is also somewhere a step to set up an alias for occ that ca be used outside the container to directly execute occ cli commands inside the container.

Set default_phone_region like this: occ config:syste:set default_phone_region --value="DE"

Check if you have to alter this line in the collabora/loolwsd.xml file:

<host desc="Regex pattern of hostname to allow or deny." allow="true">nextcloud\\.sporada\\.eu</host>