@Kpyttlick
You haven't said what your circumstances are. There are two reasons for why you might get a message saying your camera is attached to another account when trying to install your camera in the Google Nest app.
The first reason is that you bought or inherited the camera from someone else and they failed to remove the camera from their Google Nest app while still on their Wi-Fi network and while the camera was online (which should trigger an automatic factory reset).
The second reason is that you are trying to reinstall your camera (for example, after a Wi-Fi change, or because you're trying to switch the camera to a different account) without first having removed the camera from your Google Nest app while still on your old Wi-Fi network and while the camera was still online.
On both cases, you can try performing a manual factory reset (not a restart), as described here. You'll want to hold down the reset pin until you're sure the factory reset has occurred, as described in the Help topic:
https://support.google.com/googlenest/answer/9252162
If this doesn't work, or if you have one of the older Google Nest cameras that can only be factory reset by removing them from the Google Nest app, Google Nest Support in the past has suggested two alternatives:
1) Disconnect the camera from power for 48 hours and try to reinstall.
2) Wait for 30 to 60 days (depending on the length of the previous customer's Nest Aware subscription) and try to reinstall.
