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Hey @tuesday003! 🙂 Welcome to the Fitbit Community!
It's weird that your heart rate is not working properly. Have you tried to restart your Blaze? If not, you can easily do this by pressing the left and lower right buttons for 10-12 seconds. This will make your tracker to reboot. After that, make sure that the green ligths on the back of your tracker are flashing and try it out and see if it does measure your heart rate.
Let me know how it goes!
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