Sonos not found.

I have AT&T fiber and has worked flawlessly. Recently, last couple of days I’ve had WiFi drops. Tech came out this morning and changes a wire outside . Nothing else was changed. I have the same modem router and same password as before. Everything in the house is connected to WiFi and working. Two rooms  with Arc, sub, and ones are working. However , app says Sonos not found and has to be on the same network as devices.  Only thing I see different is iPad has this privacy warning on the WiFi (see pic) but iPhone does not..Again , same everything as before. Pics show what I’m experiencing . Ideas?