I have ADT and an ADT pulse doorbell camera. I recently used the “works with Google” to add ADT devices to my Google Home app. It finds and imports all of my sensors and alarm but not the doorbell. The doorbell is working in the ADT app. I have tried to unlink and delink the account, reboot the doorbell, as well as sync devices. It always finds every ring except the camera.
To confirm, have you tried resetting your camera? If so and you get the same result, I highly suggest contacting ADT support for additional assistance since it's only happening with your camera.
Let us know if we can assist with any Google Nest speaker concern otherwise, we'll lock this thread after 24 hours.