Your app is called Beltone HearMax, but what is your hearing aid type? You will need to have a made for iPhone hearing aid for this to work, do you have one of these?
- Beltone Achieve*
- Beltone Amaze
- Beltone Benefit*
- Beltone Boost
- Beltone Boost Max
- Beltone Boost Plus
- Beltone Boost Ultra
- Beltone Celebrate*
- Beltone First
- Beltone Imagine*
- Beltone Legend
- Beltone Silk
- Beltone Rely
- Beltone Trust
This are the made for iPhone hearing aids from Beltone
After you've verified that your hearing aids are compatible, follow these instructions
- On your Mac, choose Apple menu
> System Settings, click Accessibility
in the sidebar, then click Hearing Devices on the right. (You may need to scroll down.) - If prompted, turn on Bluetooth.
- Power your hearing devices off and back on again.
- If you’re not sure how to power off your hearing devices, refer to the instructions that came with them or check with the audiologist who helped you set them up.
- When your hearing devices appear in the list of available devices, move the pointer over them, then click Connect.
- Pairing can take as long as 60 seconds — don’t try to stream audio or otherwise use the hearing devices until pairing is finished. When pairing is finished, you hear a series of beeps and a tone.
See this link for further reference
Use hearing devices with your Mac – Apple Support (UK)