Nextcloud does not work on the phone?

I have a problem. I want to get my Nextcloud on my phone, but get an error message from Safari. It works on my laptop.

Which message?
Take the app from Nextcloud from the store

Have I already tried, there's a connection error

I want to get my Nextcloud on my phone, but get an error message from Safari.

Which error message do you get exactly?
Why do not you use the app for it?

Have I already tried, there's a connection error

I already had, because it helps to remove the created account in the app and then create new.

Linux Hase

Does the access from your mobile phone work in the WLAN or not at all?

Should it work in the WLAN but not via the mobile Internet connection, your cloud server may not be configured correctly.