Please check the following:
Open the Settings app on your iPhone
Go to Privacy > Motion & Fitness
Is Fitness Tracking turned on? If not turn on Fitness tracking
In the same list make sure Pillow appears on the list and is turned on
Please check the following:
Open the Settings app on your iPhone
Go to Privacy > Motion & Fitness
Is Fitness Tracking turned on? If not turn on Fitness tracking
In the same list make sure Pillow appears on the list and is turned on