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Hello @Neilt77, thanks for joining the Fitbit Community, it's great to see new faces around! 
I'm sorry to hear that your step total on your challenge isn't updating. Below are possible reasons for this issue:
1. Your steps have fully synced to our database but you're not viewing the mobile app dashboard in Live Data Mode. (Live data mode would show the word "connected" under your tracker tile).
2. You manually logged an activity. Steps from manually logged activities do not count toward challenges; only steps recorded by your tracker or MobileTrack are counted toward challenges.
3. You used MobileRun to track GPS data with your app. Only steps recorded by a tracker or MobileTrack are counted toward challenges.
4. All challenge participants are not in the same time zone.
Please keep in mind that is also recommended waiting 15 minutes after syncing your Fitbit data to see if your challenge updates.
I hope this can be helpful, give it a try and keep me posted in case you need anything else. 
Best Answer