My home is set up with a 2-node ASUS ZenWiFi AC AiMESH wifi set-up. I’ve got a few SONOS speakers throughout the house. My Beam is hard-wired to the main router. However, I still get the “Wireless range extender” error message when trying to play the same thing on multiple speakers. (“Some Sonos products are using the WiFi from a range extender device. If you include one of these in a room group, you won’t be able to play music in that group. To ensure playback in all grouped rooms, you’ll need to permanently wire a Sonos product to your router.)
I’ve unplugged all the speakers, re-booted the router, then plugged them back in one-by-one, but the error still happens.
In my “About My System” page, all speakers are showing WM = 0.
Despite the error message, my speakers do seem to be able to connect in a group, but not consistently, and sometimes they are very slightly out-of-sync.