A warm welcome to the forums @JollyMolly.
Thank you for providing the information regarding this difficulty with your Charge 6.
As you may know, Active Zone Minutes are based on your heart rate and whenever your heart rate reaches one of the 3 ranges, your Fitbit will start recording Active Zone Minutes: You earn Active Zone Minutes for time spent in the moderate (fat burn), vigorous (cardio), or peak heart-rate zones. In order to know more information, take a look at this help article: What are Active Zone Minutes or active minutes on my Fitbit device?
Since the data of Active Zone Minutes depends of your heart rate, take in consideration that if you're having inaccurate heart rate readings, you will not see active zone minutes. In this situation please, see: What factors can affect my heart-rate reading on my Fitbit device?
If you haven't done so, try to restart your Fitbit device as indicated: How do I restart my Fitbit device?
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