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Looks like Sleep Number is a brand of "smart" beds (I’m not based in North America, so wasn’t familiar with them), and SleepIQ is their app.
Did you check this help article from their site?
Dominique | Finland
Ionic, Aria, Flyer, TrendWeight | Windows 7, OS X 10.13.5 | Motorola Moto G6 (Android 9), iPad Air (iOS 12.4.4)
Take a look at the Fitbit help site for further assistance and information.
Did you find a solution? When we first got the bed it synced with my Versa, but it hasn’t for quite a while. I unpaired and re-paired, but still no luck. I don’t remember exactly when it stopped syncing, but I think it was around the time FitBit started using a sleep “score” too.