@bvddds
If the Setup Code for the Google Nest Doorbell (Battery) is 8 digits (numbers only), then that's a change from all past Google Nest cameras and doorbells. ALL of our doorbells and cameras, including the Google Nest Hello Doorbell we installed a month ago and the Google Nest Camera (Battery) we installed four months ago--and every other camera and doorbell installed in the last 2 years--has a 6-character alphanumeric Setup Code. In other words, it is a mixture of numbers and letters. And the Serial Numbers, which are quite a bit longer, around 14 to 17 characters, are also a mixture of numbers and letters. I have saved all of them, because they're needed if we ever need to reinstall them.
I just found the install videos for the Google Nest Doorbell (Battery). While the image isn't entirely clear, it certainly looks like, on the back of the doorbell, there is the QR Code, with the Serial Number above it and the Setup Code below it, just like on the back of our Google Nest Hello Doorbell.
