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I did not get a pre-order code for the way of the berserker missions and items. I have checked both my email receipt and all emails mentioning assassin's creed Valhalla still nothing
If you preordered the game for PC from us, the preorder bonus itself should already be activated on your account. There's no need to wait for a code to redeem.
If you ordered from another retailer, you'd need to speak to them to make sure that you have been provided with all of the redeemable codes you need to access any additional content you were eligible to receive, including the Way of the Berserker preorder bonus.