Did you pre-order from Sony or the Xbox marketplace? If yes, you don't need a key. You have access to beta.
If you pre ordered through a shop, check your receipt or contact the website you bought it from.
English
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I ordered it off of the Xbox marketplace, I even called Xbox but they didn't know what to do either.
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Is it full price to pre-order on the system? I've only ever done them in store
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Xbox pre-order is full price. I don't know about PlayStation. In my store I paid £10 to pre-order it.