Zwift question relating to speed and distance not showing.

Hi guys, broken collar man here again. So I finally borrowed the basic turbo off the friend (Tackx mag one with the resistance type strap the older ones used to have). Set up zwift account and paired my crank based power 2 max via the ant plus dongle etc and all tickety boo. Power and cadence showing on free ride zwift screen and same info on my wahoo bolt. Now I only rode like 2km after hobbling on the thing for a test but then when I uploaded on strava it just shows 0km with no speed and nothing to do with zwift ? Am I doing something wrong ? No speed was showing on wahoo either but might that be as I dont have a magnet for the cadence ?
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https://my.zwift.com/index.jsp
Zwift sorts everything out, once a PM or smart trainer has been linked -- speed on Zwift is not the speed at your turbo back wheel.. it is set by algorithms.