Hello. Since Bungie is not the retailer it's best that you contact your platform support team - Blizzard in your case. They will be able to advise if this is a doable option for you.
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Thank you for responding! I did what you mentioned and Blizzard said that upgrades of that sort aren't handled through them. They informed me that they only sell the Digital Deluxe Edition as a solo product and the Season Pass as a solo product. I emailed Bungie about a separate issue and they helped me quickly and easily regarding a purchase but they said I should reach out through here. Any idea of what I can do next?