we couldn't connect to network. make sure you are using the right wifi and password. Then try again

Thank you @Stormy Norman same problem and was getting very frustrated with the same error msg - your help and direction to uninstall the app fixed it. Thank you! Many hours now saved and once app reinstalled all working perfectly 

For other user also experiencing the same issue, the Sonos One SL also needed a software update but this does not trigger until app uninstalled and reinstalled so another reason my devices were not connecting 

Thanks, ​@Stormy Norman 

I had the exact same situation as you: changed the router, couldn’t update the ROAM settings to the new WiFi. It was driving me crazy!

Your method worked like a charm 💋

The only thing i did differently was that there’s no need to restart your phone - just turn flight mode on, then off, as it restarts all connections on the phone (same thing if you ever find yourself having network problems).

Just ran into this with the Android app. Worked fine for the beam but even that actually never really connected but at least it accepted the password and tried and then timed out. But then the sub mini just didn't accept the password and got the same exact screen that you got. If you look at the reviews for the Android app right now on the Play store, you will see that the last 20 of them are all one and two stars. There's something seriously F'd with the app right now. 

I restarted the phone. Restarted the entire Google mesh Wi-Fi network. Even tried connecting with the ethernet cable. Even factory reset both the beam and the sub mini. Did all the things. And still get the same message you got above. The error message is incorrect. There's nothing wrong with the password but whoever programmed it put the wrong error message there.

We are going to be returning these devices to Best buy. The weird thing is is that when we first got them a couple months ago the setup worked fine and they both connected and then all of a sudden the sub stopped working. And then we just went to reset everything up and now I can't set any of it up. It's all broken.

I’m trying to downgrade all of my Sonos speakers to S1 as a last resort before I just throw it all in the nearest skip. Plucked an S1 out to test the downgrade process - reset it and plugged it straight into the back of the router. I cannot get past the stupid Wi-Fi error no matter what I try.

I’m going to give things one last attempt (I have one more Wi-Fi trick up my sleeve involving an old wireless access point and an ethernet hub) to see how that goes. Since May, Sonos are pretty much a swearword in my household - it’s like playing roulette to see if they will even get picked up by the app, let alone play anything or have some semblance of usability with the app. The list of issues I have with the software must be a mile long. Bose speakers are looking more attractive by the day. I swear I will never go back to Sonos.