I wish I could add screenshots, but here goes.
To enable MyFitnessPal to feed data to HealthKit, go to the More - Apps and Devices - Apple HealthKit - manually enable each indiividual data alement to share with Apple HealthKit. Then go once into the Apple HealthKit Settings and reconfirm.
Also, in MyFitnessPal, go to the More - Steps menu and enable it to use the iPhone device processor as the pedometer or any other that is listed there.
To enable MyFitnessPal to feed data to HealthKit, go to the More - Apps and Devices - Apple HealthKit - manually enable each indiividual data alement to share with Apple HealthKit. Then go once into the Apple HealthKit Settings and reconfirm.
Also, in MyFitnessPal, go to the More - Steps menu and enable it to use the iPhone device processor as the pedometer or any other that is listed there.