Issue started on 14th September. I can see from the other device forums that many users on many devices are experiencing the same issue.
When using Garmin Express, I can see all of the FIT files in the New Files folder but they don't get processed by the my Garmin devices.
If I open the FIT files I can see the segment names and the size of the files are proportional to the length of each segment.
I have tried refreshing all the segments by switching to Garmin segments and enabling Strava live segments again but this does not work.
I have also tried both the mobile app and Garmin Express