I have one run that CityStride never recieved

My latest three run was 1 January, 27 December and 13 December, but the one I did on 27 December was never received by CityStride. But they are all on Strava.

Is it possible some how to uploade this single run to CityStride ? I tried the “Syns now” options, but did not work.

Hmmm I just started a sync so that should bring it in - I would think that your “sync now” would have done the same thing, though.
Can you share the Strava URL for that activity? You can message me if you’d prefer that not displayed here.