Connections

I use hearing aids with my S21 Ultra. They are connected to my phone using BLE (BlueTooth Low Energy) and not the BT that my smartwatch is using. That feature is turned on in my settings.
Settings/Accessibility/Hearing Enhancements/Hearing Aid Support/Bluetooth Hearing Aids.
Then in my aid's associated app there is a option to pair the aids to my phone. Following the prompts married my hearing aids to my phone.
I hope this helps. You may have documentation on the given procedure for your particular brand/model of aids and if you can't successfully connect them to your phone I would suggest contacting your audiologist. They should connect and you will enjoy the feature.

 

Do your aids have an associated app that can be had from the Play Store? My Resound have an app that will insure both aids are connected to the phone. If I don't boot the app I will occasionally have an aid drop connection. One will drop and then connect and the other might drop out at some point. Mine do not stay connected to the phone without turning the app on. It only effects streaming and direct connect on phone calls. Once the app has been initiated it will show each aid connection and there is never a problem from that point on.

 

The app is a great tool all it's own. It will allow the changing of environments for my aids as well as adjust volume and balance. It even has a mini equalizer to adjust high/midrange/base.

 

I reread your last post and realize that your aids are connected. If you are seeing the option to change volume in the left and right aid in the phone settings... they are connected. My only other suggestion would be to disconnect that pairing which you should see that option also in the phone settings we were discussing. Once disconnected, once again pair them with your phone. I can't begin to know why all marriages aren't created equal and can't promise a second connection will be better than the first. However, I have been cheated out of BT features on ear buds only to have them work with a new pairing. It's worthy of a try. I would be in contact with your audiologist if all fails. I do not think that your S21 is the problem. Good luck.