If you have other Nest products installed, check out this thread's
comment by @BoulderJ! I was having a conflict with the Nest Doorbell and
it solved my
problem!https://www.googlenestcommunity.com/t5/Nest-Protect/Nest-Protect-P009-Error-Cannot-Add-To...
If you have other Nest products installed, check out this thread's
comment by
@BoulderJhttps://www.googlenestcommunity.com/t5/Nest-Protect/Nest-Protect-P009-Error-Cannot-Add-To-Account/td-p/423976
@BoulderJ - I can't thank you enough! I've been having the exact same
problem and I was at my whit's end! Disconnecting the doorbell from the
iOS App and then reinstalling after the Nest Protects solved the issue!