I have one camera that's still using the old Nest application because it has timelapse capabilties. I am able to interact with the camera using the Nest app on my Pixel 9 Pro, but recently, logging into home.nest.com on my Macbook's browser has stopped working for me. I use single-sign-on with Google, and it appears to start to connect, but kicks me back to the login screen every time.
The network console seems to indicate that there is an unsafe eval, and then an iframe with a call to fine-allowlist returns a 400 error, before a login.js errors out with "Nest scope is missing"
I have this problem on both Firefox and Chrome. I admittedly haven't tried Safari.
