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Does it show basic sleep stats like time asleep and such?
Check the web dashboard and see what is reported there. I’m wondering if it is on the website but not on the phone or watch.
Are you running the latest phone app version? There is a synchronization between the watch and phone which versions may impact.
There are sensitivity settings for sleep in the Fitbit app. Get into the settings screen (tap profile picture), go to “activity & wellness”, and see if it is set to “normal” or “sensitive” under sleep.