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Welcome to the Fitbit community, @AmandaHefer!
Sad to hear that your Sense 2 isn't working as expected.
As there is a chance that your device's battery is totally drained, please try to charge it while having a closer look here to exclude all possible sources of error:
Why isn't my Fitbit device's battery charging?
Please pay special attention to this:
How do I clean my Fitbit device?
I'll keep my fingers crossed.
Best Answer