Tried a bunch of stuff to resolve the issue:
1) revoked and re-added permissions between Fitbit and Cronometer in both apps.
2) synced fitbit
3) Did a force sync from Cronometer (Cronometer gets updated, but Fitbit does not)
4) Verified that all export/import permissions are checked on the Cronometer app
5) Finally, deleted and reinstalled the Fitbit app.
The problem started yesterday (6/27)
Best AnswerSame problem here. Just got a Fitbit today and have been using cronometer for a long time. Contacted cronometer via Instagram and the problem seems to be on fitbits side. Annoyed that I got a brand new (my first) activity tracker, but can't even use all the options.
Mine finally started exporting Cronometer's data into Fitibt later that day - took several hours. I had read where Fitbit might restrict how many times their APIs can respond. The Fitbit data moved over to Cronometer instantly, which was weird. But it's all been working as expected since then. Good luck. 🙂