Activity and Nike running club not syncing

Hi, until this morning whenever I ran with the NRC app on my watch, the workouts would sync across to the activity app. From this morning, all of my NRC runs have now disappeared from the activity app on my phone and so the app is showing that I had no activity on 31st May for example - when I ran this day, the run has just not synced across from NRC. Is there a way to sync past runs back to the activity app at all? Thanks