Cross post and some extra text as there are several threads on this topic:
I suspect it might have something to do with incorrect instructions for metric vs imperial - can others confirm?
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I tried several times with my Tacx Flux and indeed got stuck eternally cycling at 37 km/h.
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twice I accelerated to ~50 km/h and then I got the instruction to spin down.
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last time I set Zwift to imperial units. It told me to cycle at (I think - please confirm) 30 mph (=48 km/h). Worked.
So it might be as easy as accelerating to 48 km/h until Zwift fixes this bug or USA switches to metric, whichever comes first
Sorry for not remembering the exact numbers but forgot to post this right after I did it.