Cannot connect HRM Tri / HRM Run

Hi Folks - 

Since couple of runs I noticed that I lost my running dynamics...so I checked the connection from my Fenix 6X Pro to my HRMs
I owned both HRM Tri & Run ... while checking the connection I noticed that they are just not connected to the watch.

I tried to remove my sensors from the list and adding them again .. no luck ... the watch is not detecting the HRMs (did try with both the HRM Tri & Run).

I tested those HRMs with my Garmin Edge 830 - they are working flawlessly.

I was running the last SW version - 4.30 ... so I updated to last beta software (4.63) .. same issue I'm not able to add back my sensors.

Does anybody have seen this issue before ?

Just wondering if it's SW or HW issue ...

Thanks in advance if you have any clue on this one.

Cheers.