We're working on a fix! In the meantime, give this workaround a try.
- Launch the game on PC through Game Pass and let the game reach the main menu.
- Turn on your Xbox for Restart it and launch Gunfire Reborn on the console.
- When prompted that your account is already in use, choose to play on Xbox. This will disconnect your game on PC. When the Quit prompt appears, quit the PC version of the game.
- Choose Yes when your console asks you to sync save data from the last game.
- After this, your game should boot up, on console, without issue.
If this doesn't fix your issue, please let us know https://support.505games.com/hc/en-us/requests/new