nextcloud does not connect - no_oauth2

Hi,

I use latest Filerun and correct 2.6.2 nextcloud version app on Windows.

It does not connect, the server gives back "no_oauth2".

I cross-checked with the filerun demo URL but just the same.

There were no issues when installing the app.

I tried Mountain Duck demo version, it works fine, so the Filerun install should be fine.

Any ideas?

Thanks,

Hasko