How can I have Nextcloud accessible under two different domains (Shared Hosting)

EDIT: For some reason, it works now. This thread can be closed, thanks.

Hello everyone,
I have setup Nextcloud on a shared hosting server (my webhoster offers an automatic Nextcloud installation). I would now like to have the Nextcloud be accessible under two different domains – the web interface as well as the WebDAV/CalDAV/CardDAV funtionalities.

I tried having both domains point to the same folder: the second showed a blank page
I tried adding the second domain as “trusted” under /config/config.php: same as above

Do you have any advice for me as to how to achieve this?

Many thanks in advance!
Hamburg, Germany