Are there any FCC or other rules that require emergency signals from a Spot or InReach to be received similar to deactivated cell phones?

Inactive cell phones can still call 911 and emergency responders can still be sent. It is great to put old phones in various GO bags or 72hr kits. I'm wondering if Spot and InReach messenger systems that have inactive subscriptions could still send out there SOS signals and function like a PLB (have emergency response). Or would it just fall of deaf ears?