Not pairing my fenix 6 pro solar with my new shokz headphones

My fenix 6 pro solar won't connect with my shokz headphones. I tried a lot. 

1. turning my bluetooth off of my iphone

2. turning shokz on while searching from my watch

3. resetting te watch

My shokz connect immediately with my phone when I want to, so that cant be the problem.

Any help?