odd. I was able to download it last night when it ffifirst surfaced.
There's an Xbox Companion Beta, but that's something different. Or maybe you just got lucky lol.
Predictions (Made July 2019)
LTD: PS4 - 130m, Switch - 110m, XBO - 52m 2019 : PS4 - 15m, Switch - 18.8m, XBO - 4.8m 2020: Switch - 22m (Peak Year)