Web logins work, all other access fails

Sorry if this is a stupid question. I’ve installed Nextcloud and created an admin user and a non-admin user. Both users can login through a browser. But all attempts to connect from iOS or Android or to connect Linux using davfs2 have failed. Some give authentication error messages, although the iOS app just cycles back to the login without any message.

Via user settings, I can see a list of connections from iOS and Android devices, but none of them were successful. I can’t see anything about Devices, my settings page doesn’t seem to have the same options as the page shown in the manual, which includes “Devices”.

Is there some vital step that I’ve missed?

Yes, it was fairly stupid. Followed a tutorial for installing nextcloud that didn’t mention the configuration of the vhost for mod_dav. Without that the remote applications won’t work. Now fixed.