Hm that is weird. I set mine from sunset to sunrise and it works. Do you have location enabled? It may need to know your location before it initiates it.
Ha. No, I don't. I did set where I live in the phone, but didn't turn on location services. I will try that tonight. Or try the custom scheduler. I didn't have to turn on location for my iPad for night shift to work, so I didn't even realize the Pixel might need it. Oops.
Thanks for the help all. Hopefully the location services or custom scheduler solves the issue. ??????