Tried this without success. The auto set enable/disable still does not appear.I found this thread and had the same issue in my 2019, but low and behold no updates or answers for years! So if you also found this thread google searching after daylight savings time, allow me to update how I got it to work:
Turn the vehicle completely off, so that the radio is completely off. Then, I turned on the console but not the vehicle by pressing the middle power button. From there, it made the auto time set option available where it had been missing before. Turned that off and was able to set time manually!
Took mine to the dealer, who was able to fix it. He also have me a copy of some documentation from Chevy in case it happens again.Tried this without success. The auto set enable/disable still does not appear.