We recommend resetting Health access in Seven by following these steps:
1. Open Seven and go to Settings located in the 'Workout' tab, then select 'Health' and turn the toggle off and on again.
2. Go to the Health and tap your profile icon > Apps > Seven > Turn all categories off and on again.
Please note: this won't sync past workouts but it should reset your connection to Health so that any future workouts will sync again.