It's been around three weeks since Quantum Break was temporarily delisted on Xbox due to "licensing issues", but the game has returned to the platform today, and it's included with Xbox (and PC) Game Pass as well.
You can download it right now via the Xbox Store on your console, or Xbox app on PC.
It was announced back in early April that Quantum Break had suffered a few expired licenses that were "in the process of being renewed", but clearly this took a little longer than anticipated, hence the three-week absence.
Doesn't matter now! Quantum Break is back on Xbox Game Pass, and it's hopefully here to stay.