GoKawiilFitbit Air users report persistent iPhone syncing failures via Error 16
Multiple Fitbit Air owners on Reddit and Google's support forum say their trackers cannot sync with Google Health on iOS, often freezing on a connection screen before showing Error 16. Reports date back to early October and continue into November, with affected users saying standard fixes like reinstalling the app, re-pairing, and resetting the device haven't resolved the problem. Some users who contacted Google support say they were told it's a known issue being worked on, but have received no follow-up.