I had the same problem.
My old headphones (AKG 50 which I recieved as a gift when I purchased Samsung Galaxy Note 8) have been not synchorized with Pro Tools.
So, after reading a review about Samson SR850 on
https://whoishuman.io/cheap-studio-headphones/, I have decided to buy especially because of the quality of sound and its cheap price.
Guess what, pairing problems have not been resolved. So, I discover that you are using a really old version of Bluetooth (my macbook pro 2012).