You could make a support ticket for it.
Go to support > creat a new ticket > pick category : add new game to list and hope they can help you :)
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Not sure that would be an option in this case due to XXL being a one of the newer bundle types.
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https://www.steamgifts.com/discussion/S1dIc/just-cause-3-xxl-giveway-question
Long story short, no, there's no possibility to add the XXL Edition and making a GA for the XL Edition is your best option, as the XXL Edition includes everything the XL Edition does.
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There's no Just Cause 3 XXL Edition on the games list when creating a GA, only a XL edition
Is this edition not available on SG?
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