30/03/2020 around 9PM I had a ride on zwift which dit not sync to my zwift and strava account. The zwift app remained open for a good ten minutes (probably trying to upload the activity) but then it gave up, I had a solid internet connection at the time and did not kill the application manually, it killed itself.
On zwift.com the activity appears in my feed but when I try and open it an infinite loading screen appears. The error I get in the console is:
https://s3-fit-prd-uswest2-zwift.s3.amazonaws.com/prod/1787989/9faf938c-517444749654788224.1000.json 400 (Bad Request)
On the zwift companion app I get the error “Activity detail could not be loaded”
Presumably the zwift companion app just handles the json not being on AWS s3 slightly better.