Hello @Peter1000, I've moved your post to the third party app forum, you'll get a better chance of an answer.
I also know there are several other threads on this subject.
Same issue here. Yesterday's morning run synced ok, but this morning's run and this evening's run both have failed to sync.
mine has not worked since last week and i thought it was something up with my fit bit. wonder when they will get the probelm sorted as now it is a problem i see.