Did you use the default RZ616 Wi-Fi/Bluetooth with the old 7040 series board and the default RZ717 with the new AI 300 series board?
If not then what?
You could try using a different Wi-Fi/Bluetooth card and/or different drivers but since I don’t know exactly what the answer is, it would probably require quite a bit of experimentation to find a solution.
I had a similar issue when switching hardware. It might be worth checking if the latest Bluetooth drivers or firmware updates are available for the Ryzen AI 300 series. Sometimes the default drivers don’t fully support the headset mic yet. Updating drivers or reinstalling the Bluetooth stack could help.