Spoke too soon. The Jabra is not usable outside with this watch. It seem to have receiver on the left side too. (cuts out badly when watch is on the right hand). Works if the left hand is raised above the hip but otherwise when just walking and swinging the hand, it cuts out non stop.So have to walk with arms in front of the hip.
No such problem when the headphone is paired/connected to my Note 9. No matter where the phone is the headphone connects with no issue.
This tells me the BT on the watch is flaky for headphones at least as far as my device is concerned.