I have P20 And p20pro that fails connect and work properly with some local network devices (Lightwaverf and Dreamscreen) I did try to reset with no luck. Used different router and network with no luck. P20 Lite and other android devices works all as should, so issue is only with P20 and p20pro!
So conclusion is that something is blocking network interface on p20 p20pro.
How to resolve it?