The problem is that it does not even showing in the bixby routines list.This auto detect sleeping feature on Bixby Routines requires the device to learn your sleeping patterns (this is mentioned in your first screenshot too, I believe). Have you factory reset recently? Did you update to One UI recently (not 100% this would cause it)? If you deleted the Bixby apps at any point and deleted the data and cache then restored them, your usage patterns would be forgotten. It could take up to 14 days to relearn.