Varia to iPhone and Bluetooth helmet speaker

Varia alerts not playing through helmet Bluetooth speaker. 
setup:

Varia

Edge 830

iphone with Varia app

Blutooth helmet speaker. 

I’m hard of hearing and can’t hear the edge on my bars for navigation or radar alerts so I got the speaker and connected to my phone. 
Navigation works perfectly from the edge and the speaker plays all the turn details etc clearly. Radar alerts don’t play at all. The Varia app on the phone works as expected but is also silent. All of the volume settings on the Varia app are turned on.  Varia sound alerts are still going through the edge. 
any ideas on how I get the speaker to play the radar alerts?

thanks