Same for me.
Restarted app; no change.
Restored purchases: no change.
Reset Fitbit Charge: no change.
Deleted and reinstalled app: Huzzah! I got steps, heart rate, sleep score and activity back.
Except it disappeared again.
Probably not a bug; it's something personal against us 😉
How quickly can another version go through the App Store verification process these days? I guess we'll find out.
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