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Mine has never worked. There have been 2 firmware updates in the last week, which I have done. And I've contacted fitbit support twice with no response.
Whet onto a chat with Fitbit and they asked if my ALL DAY SYNC was turned on. My answer NO. This is the suggestion as the Sleep Stages is a new setting and the All Day Sync is required
My HR hasn't done the new format yet. My husband's has. He has an android phone and it shows up on there. Not in my iPhone. We got our fitbits in the same order directly from Fitbit
Mine was working fine with the 'All day Sync' setting OFF, till yesterday. Now it's back to the old format 😞 The 'all day sync' function sucks far to much battery life.
It's on your smartphone or the device you use for the app. You click on the fitbit icon at the top right of your dashboard and the option is in that menu.