Welcome to the community 
Does the pairing mode work in general? Or to put it another way, has it been working fine on the FP3 because you didn’t have to pair it in a while?
If you completely remove it from your BT devices on the FP3 and re-pair it, does it connect again (to the FP3)? 
According to the description on their website it uses aptx, so it might also be related to the Bluetooth issues introduced in a previous update