I'd never heard of bluetooth "connectivity" for hearing aids, but I guess one learns something new every day.
If your aids do have bluetooth, is there a way to turn it on/off?
If so, I'd try this:
1. Turn on BT "on the aids".
2. Open the BT preference pane
3. Turn on BT and see if it can "discover" the hearing aids.
4. Not sure what will happen next... 😉