Wrong server address mentioned in New user welcome mail

Hello, this is my first post here - hope you could maybe help. Thank you very much in advance!

I setup a new Nextcloud instance on a shared host (Ver 18.0.4) and after creating, I noticed that new users will get a mail with the wrong server address mentioned:

https://nextcloud.XXXXX…de (double dots before top-level domain) – do you know where I could fix it? I tried, but haven’t seen the right place.

Example: https://imgur.com/a/01SdpCR

Best regards, Michael