I usually have 99% of my activities with power data, but I am participating in a cycling research study where power files are not available. I have been recording HR data and happy with an XSS derived from that data. Recently I had an activity that has provided no HR derived XSS. No settings have changed, and XSS derived by HR is still activated. Any ideas.
Likely will try to delete and reimport from Garmin, but strange that the HR data is there and no XSS provided. 2 days prior no issues.