I was trying to figure out why I was seeing Pw:Hr in TrainingPeaks and I’m happy to have found this tread. It confirmed that Pa:Hr is the metric to be used for the threshold tests, and ended up leading me to a solution to show Pa:Hr.
I was also having to delete power data to see the Pa:Hr metric. But then figured out that if the Completed TSS on the Run’s Summary screen is set to “rTSS” or “hrTSS” then Pa:Hr will be shown on the run’s Analyze screen.
Note: this only works on the ThrainingPeaks’ webapp, iOS continues to show Pw:Hr.