A couple months ago I made post about this, but the solution what short lived (less than 24 hours).
Cellular connection It’s been like this before 19.1 and I have terrible cellular connection in our location, so it rarely works. I would like to try expert, but it never works because of this. I have tried: Network Reset, Router Reset, Phone Restart, IF log in/out and restart and reinstall. I can access training server though. I do have a VPN but I don’t see why it would only block 2/3 servers. This may be on apple’s end. Also it is just my device.
Latest IOS and IF versions.