Headphones connection issue

Hi All, 

I'm trying to connect my JBL Tune 120 TWS to my new GF+. I have managed to pair the phones but I cannot connect to them when and listen to music. I tried to reset the headphones and the watch, re-pair it and nothing works. I don't have the phones connected to my iPhone. I tried connecting another set of earphones - EarDots - and did not succeed eather. 

Any suggestions on what I'm doing wrong? 

Thanks

Bart