Season pass wont carry over to xbox one

Ghosts XBOX 360

I have give a sealed copy of the 360 version of cod ghost with valid season pass code he redeem it on his 360 system but he say he cant get season pass for the xbox one version free yet I was able to do so a month or two ago is there a certain way to  get to do this what are we missing here let me know thanks

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Registered: ‎08-09-2018