I can only give you some advise from what i have learned from the Goldwing 2018+.
The Goldwing and Bluetooth intercom is very tricky. Bluetooth intercom can cause the bluetooth connection between the riders headset and AA/ACP unit to break. I switched to a mesh headset and this problem was solved.
First clear your motorcycle and headset with from all previous paired devices
2.
Connected/pair the riders headset to the bike.
3.
Connect the phone for AA/ACP to the bike with a proper cable (OEM cable is prefered).
4.
Make sure everything works.
5.
Connect the pillion headset to the riders headset. And test this with a proper ride.
Just like @mzokk said:
DON'T PAIR THE AA/ACP PHONE TO THE HEADSET.
This is the basic setup. From here you can expand further. But be aware Bluetooth is not the most stable platform with multiple devices connected.
not pushing you around. Your question went along with the move.
The stability of CP and AA have had an update as of version 488 witch is finaly out on both Android and IOs.
Did you install that update