Sharing a Thermostat with "auto-switch"

I’ve shared a thermostat with my wife, and enabled “auto-switch” so it would detect when we are away. However, it seems to trigger is just ONE of us is away from the house and go into “away” mode. This is not a reasonable behavior, it should only go into “away” mode if BOTH of us are away. is this documented somewhere?

Would it be better to just login on both phones under the same account? Or it that still react to just one person being away?