I just bought a new copy of Assassins Creed Odyssey recently and i already have the bonus mission included so if anybody wants it, have at it! Codes for Xbox One! :
Assassin's Creed: Origins Cheats, Codes, Cheat Codes, Walkthrough, Guide, FAQ, Unlockables for Xbox One - Cheat Code Central
Unlock Assassin's Creed Origins Secrets of the First Pyramids Mission DLC Free- Xbox One, PS4 and PC - video Dailymotion