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It may just be that you were not exercising hard enough or long enough to get active minutes. You really have to be very active to get them. See fitbit's guide at https://help.fitbit.com/articles/en_US/Help_article/1379
The day before, I did the same with same duration and it count them. Both of them were considered as fatburning. I am having this problem after upgrade.
Best AnswerYes I'm having this problem too. I've tried resetting, reinstalling ect. but to no avail. The problem isn't that you need to exersice harder ; it's that Fitbit need to make their products fit for purpose.