It syncs well via Bluetooth but the app wasn't updated and it doesn't officially support the Versa 2. That's why it doesn't have the sleep score or the Alexa setup.
Not sure if this helps, but, when I had my 950XL and Elite X3, and my Fitbit Surge (which I still have), I managed to get only phone calls and SMS notifications (mainly SMS). It was very hit and miss. Maybe Google (no longer Fitbit - RIP) never bothered to update this for W10M?
I haven't tried my Versa 2 with Windows but my Ionic would get all sorts of notifications as recently as the January 2020 update (aka the "thank you for playing along" update). You have to remember 2 things: (1) PWAs never have supported push notifications for WM10 so that rules out many apps. (2) You have to manually toggle notifications in the Fitbit app exactly as you would on Android. Apple has to be different as always, as notifications come in to the phone, the app will create a toggle in the Fitbit app and then you can receive them.