A couple months ago I made post about this, but the solution what short lived (less than 24 hours). Cellular connection - #8 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.
Try going to settings then scroll all the way down to reset then press reset all network settings and report back to us once you have rejoined the internet.