Just finished testing and this one is working!
You can consider this one solved.
However, if you need some more information on this, let me know.
Thank you for the support.
This may be one for them, but I thought I’d start here. I logged my Android Nextcloud app into the server, it works fine. I then click into settings and Set up Davx, it goes over to the Davx app, but I just get a blank window where I would expect a log in to appear.
I did the same thing with another Nextcloud isntance, and that one worked. The only difference I can think is the one that doesn’t work has a self signed certificate for HTTPS.
What do your Nextcloud / Web server logs say?
If there’s nothing useful, please ask in the Nextcloud forums, because this sounds like a server thing.