I was able to connect to my MacBook Pro (monterey 12.0.1) with no issues.

When you connect to your H9 via Bluetooth, please make sure to leave MIDI and USB ports unconnected.

Also, did you make the Bluetooth connection in Mac’s system setting? Can you try connecting to your H9 just in the app by clicking “Manually select a device” -> “Connect via Bluetooth” -> select your H9 and click “Browse” ?