I have family sharing and a Apple one subscription is shares everything but Apple Music it shows I’m sharing Apple Music but the members don’t have Apple Music

Were the members who don't see it previously subscribed to it and cancelled it?

If so, they will not be able to use the free trial. They'll get access to it once you are charged for the first time.

If they did not have it, or did not cancel it, they should be able to access the subscription from the Listen Now tab in the Music app on their devices.