While riding, the EBC app (on Karoo) said new breakthrough, you beast. I had to dismiss the notification. When I got home and synced the ride, it doesn’t mention a breakthrough and says my last one was a week ago…
Hi @Mtnphotog - great effort nonetheless!
The web server performs additional data validation that isn’t possible on mobile devices — including checks for things like “sticky power”, which can affect the accuracy of breakthrough detection.
If you just barely reach a breakthrough and stop pedaling right away, you likely won’t see a significant change to your fitness signature. In that case, Xert essentially predicted your point of failure!
My advice: if you’re riding and notice you’re getting close to your MPA, don’t stop as soon as the BT notification appears. Instead, keep pushing as long as you can — the longer you hold the effort, the more substantial your breakthrough is likely to be! 
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Cool beans!