Vector 2 cadence RPM reading

I use Garmin Vector 2 single sided pedal and a rollers for my Zwift set up. All works good for wattage but i notice the RPM doesn’t register on the Zwift interface? It does however register on the companion app. But since i don’t always use the companion app (difficult on a roller!!) i am keen to see it displayed on the Zwift interface screen. Any ideas why it doesn’t? Thanks

Problem solved!!
I paid extra attention logging on today and realised I had to pair my Vector 2 pedals twice - once for the wattage (already done) and a second time for cadence.
This solved the problem.
(Although still strange that the companion app was picking it up before hand)