iPhone 12 and Coolstream Duo Bluetooth connection to Bose Sound Dock

Previously with older iPhone, could connect Bluetooth to the Coolstream and play music over the Sound Dock.

Now I have a new iPhone 12, and cannot play the sound.

I can play and hear the music on the iPhone

I can pair the iPhone with Bluetooth, shows connection in settings

but no sound comes out of the Sound Dock

I have tried two different Sound Docks and two different Coolstream Duo devices.

Trying one at a time, but neither Sound Dock has any sound with the Bluetooth connection

thank you any assistance