The Steam version of Quantum Break does not support cross-saves with the Xbox console version. 🎮 How to Play on Both Today
If you want to play on both platforms without paying twice, your best options are: quantum break cross buy
Quantum Break is a standard Xbox Play Anywhere title. This means buying it once on the Xbox Store does not automatically grant you the PC version (and vice versa) under normal circumstances. The Steam version of Quantum Break does not