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I don't see pre-orders bonuses in Greymoor tab in-game.
Did you get the mount and chapter access? The others are applied at launch.
https://www.elderscrollsonline.com/en-us/news/post/57527
"The above pre-order items arrive upon the game’s launch for your platform. In addition to this, should you pre-purchase Greymoor digitally, you also instantly unlock this exclusive in-game mount."