It stopped working for me on Jan 6 2025 and hasn't worked since. The entire FitbIt/Google corporation has exhibited a profound lack of interest in doing even the first bit of root cause analysis into this issue. Until that changes, do not expect Strava and FitBit to sync - FitBit/Google simply doesn't care
If anyone from FitBit or Google would like to demonstrate that they do care then they would post a note explaining exactly what steps FitBit/Google have taken to analyse the root cause of this problem. Have they for example, pulled logs from affected users, that show that FitBit/Strava integrations have delivered the data to Strava and it is definitively Strava's problem because of log identifiers/timestamps that they can point to?
No, they haven't done this because they don't care.
If they don't have those logs how on earth to they support this system _at all_?
Let's be very clear about this - the only entities that have the logs (or should have the logs ) that can identify the root cause of this problem are Google/FitBit and and Strava and to this point both organisations have shown no interest in the peasants who pay at least $100 a year for their so-called services.
Sick of me complaining about this? Then do something about it, and quit whingeing about being called out on your lousy service.
