Why Does Garmin Connect Show My Resting Calorie Count as Zero?

Resting calories are calculated when wearing a Garmin watch that features activity tracking. They are calculated to include the minimum calories required to support your body’s basic physiological needs, as well as your age, height, weight, and gender, plus an estimate of those calories required for activities like digestion and being mentally alert.

Why Would Garmin Connect Display Zero for Resting?

0 Resting would display in Garmin Connect if the only Garmin device that is tied to your account is an Edge cycling computer.  Edge devices do not have a way to calculate resting calories.