I should have noted, i think they are Sonos One SL

Maybe also worth noting is we are using the previous owners wifi router. We  signed a new internet agreement with the local internet provider but the actual router was the previous owners. I dont know if that has any bearing or not?

To have these speakers registered under your account, you'll need to reset them first:

https://support.sonos.com/en-ca/article/reset-your-sonos-product

Thanks, i was able to unplug the speaker in the upstairs bathroom. There is no Join button on these speakers, so when reconnecting the power i held down the Play/pause button (its actually not a button, just an imprint), the light flashed white on and off for a minute, then stayed permanently white. The sonos app is still asking me to sign in as the system owner, repeatedly. The TuneIn and Sonos Radio services dont't work, and i cannot add any new services = sign in as system owner.

The speaker in the downstairs bathroom is more difficult. It is in the top corner, the cable runs inside the wall, we have no idea where the plug socket for this speaker is. I have tried disconnecting the power cable from the speaker itself, but it does not budge, not even when using pliers. So this speaker is permanently on. I could try dismantling it from the wall holder, but that does not look like an easy task, and the power cable is still going to be stuck inside it.

Very frustrating this. I just want to get these speakers working.

Any ideas?

You may need an assistant to help, but you could switch power at the fuse box.

Unless you see the orange/white flash, you have not factory reset the unit.

 For your security, I recommend changing the WiFi password. You’ll save effort if you do this before setting up the SONOS system.

Thanks

First though, I don't understand why the upstair barthroom speaker is not resetting? We unplug the power cord, i hold my finger on the mark with play/pause, plug back in the power cord, it flashes white on and off for a minute, then stays white. I have tried it several times now. There are no other buttons.

Any idea why it is not resetting?

Don't remove your finger from the mark/button until it starts flashing orange and white.

Hi @ALI_101 

Welcome to the Sonos Community!

Sorry to hear of the issue you’ve been having in trying to get your speakers working.

In order to reset Sonos One SL speakers, there is a physical push button at the back of the product that needs to be held down as the power is applied - it is with older products that the Play/Pause buttons could be used, back when Play/Pause buttons were also physical push buttons.

However, if you are able to see the speakers in the Sonos app, then a quicker method to get them all registered to your own account would be to go to Settings icon » Manage » Transfer System Ownership. Please only perform this step when all speakers can be seen in the app.

I hope this helps.