Yeah, my mate has been complaining about this, but was too lazy to dig through the settings on his phone. Concerned, I started writing him at 03:00 AM every sin

Yeah, my mate has been complaining about this, but was too lazy to dig through the settings on his phone. Concerned, I started writing him at 03:00 AM every single night (using pre-scheduled messages) which finally forced him to configure DnD after a week or so. No problems since. You should probably do the same.