Same, this is what happened to me.I had previously installed a Nest
Protect using the app and it was working just fine. However, when I
attempted to add a second Protect, the original device would not assist
with setup, thus locking the new device ou...
This worked for me, thank you! Super frustrating with all the error
codes, couldn't get the old / original Nest Protect in the house to help
with setup. Just wouldn't connect. Removing it from the Nest app, then
adding the new Protect, then re-adding...
