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I have been uploading tcx files for a while and it worked without problems but recently they have stopped working with the very useful “Error processing Data” message.

Does anybody know what changed? Or does anybody have an idea on how to debug this?

The tcx file is still well formed and valid.

I tried downloading an old tcx from strava and then re-uploading it and that also gives the “Error processing data”


I figured it out:

 

I had this time format:

<Lap StartTime="2024-12-22T12:52:10+0100">

 

this apparently didn’t work

 

converting to UTC did work:

 

<Lap StartTime="2024-12-22T12:52:10Z">