Volume adjust Vivoactive 3 Music and JBL Reflect Flow

I have connected a pair of JBL Reflect Flow heasets to my VA3 Music
They have connected ok, but they have the volume very high and I cant turn it down. I can see the volume control on the watch and it also responds with a vibration when I try to adjust the sound but nothing happens.

Any idea on how to fix it? (I like the JBL flow headset but will have to return them if I cant use them with my watch)