Why does the Cardiogram Apple watch app says "healthKit: Failed"?
The most common reason for this issue is that Cardiogram doesn't have permission to read data from HealthKit.
Here's what you do to fix this:
- Open the Health app on your phone
- Tap the "Sources" tab (Second from the right on the bottom of the screen)
- Tap "Cardiogram" in the apps section
- Make sure all of the sources are on, i.e.: