@isazi @Stevilz hm, I have no experience at all as well with twin power sensors. I have a single power meter, however, for twin powermeters, I think that you are actucally connecting to only one of them. They are syncing between each other and sending summed up data to the receiver (phone/watch or bike computer). That is at least my opinion and this is what I read in the manual for your pedals:
NOTE: The left pedal receives the software update. The left pedal sends the update to the right pedal.
Hope that helps!