Boost will not connect to new Asus RT AX-88U router

If you have ‘Airtime Fairness’ and/or ‘QOS’ enabled in the Asus router settings, see if switching off those features resolves the issue for you.

Airtime fairness is disabled

The boost is connected directly to the router via Ethernet cable. The Sonos app does not see it.

See this thread too.. 

Also … Did you first add the Boost (whilst unwired) to the existing system, via ‘Add Product’ in the Sonos App “Settings/System” and then wire it afterwards?

QOS is off as well

If not done already, may find it best to setup the Boost uncabled initially, then cable it afterwards… see this link:

https://support.sonos.com/s/article/417

The boost was operating fine with my old router. When I replaced the router, I connected the boost using the Ethernet cable to the new router. All the wifi speakers restored after configuring the new router. The boost simply did not come back on line. I am reading that there may be some compatibility issues

So I tried reverting back to my old router. The Sonos boost will not be recognized there now.

it worked perfectly fine prior to the upgrade.

Go to Settings/System/About. Are all the units showing WM:1 or WM:2? If so they're all on the WiFi. 

Temporarily wire a speaker. Wait a few minutes. Check that About now shows all as WM:0. 

Wire the Boost as well. If it doesn't show up, factory reset it and add it again. 

You can then unwire the speaker. 

Assuming you have no Move or Roam, delete the WiFi credentials from the system. 

Thanks Ratty

My units are showing on WM:1

BTW, I have a playbar, sub, sonos1 and a sonos move

When I tried connect the sonos one with an ethernet cable, all units disappeared and my app indicated that there was no connection. When I removed the ethernet cable, the playbar and sub returned. 

One last note, on my router, I have disabled the 5G network.