UPDATE FROM STRAVA:
We are aware of this issue, and are working with Peloton to hopefully resolve this issue going forward. The workaround in the meantime would be to enter the missed activity manually on Strava.
Not sure where to report this - I put a note up on Reddit and I'm not the only one having this issue. If you use the Peloton App (I was traveling and using at a Hotel Gym) any classes will usually sync with Strava - for some reason any of the Walk/Run classes will no longer sync to Strava. You can take a cycling class, a yoga class, a stretch class, anything else - they all sync fine, but the Run/Walk classes no longer sync.
