I have 3 nest protects, because my router had changed I needed to factory reset all three and start again. 2 of the protects added fine however the third one crashed at the last step, adding to account.
When I restarted the app only 2 were showing on the account. I attempted to rectify this by factory resetting the missing one and going through set up again. however this puts me in catch 22. When I scan the qr code the app tells me to remove the device from the app as its already added, of course it isn't showing to remove it.