When I attempted to export an activity to gpx, using Garmin Connect, I get a 400 message saying that my browser made a request that was not understood. This happens when I attempted to to export to any format. I was able to convert the relevant FIT file to gpx using a web conversion service. When I tried using conversion software on the same file on my PC I got file corruption error messages.
I have, in the past, successfully exported activities. Now I get the same 400 message when I try to export previously exported activities.
Same messages when attempting this on my android tablet, my windows 10 laptop and my ubuntu desktop machine.
This is using Garmin Connect.