I can't recieve the item from

As seen in the image, it says “Missing steamguard and/or oauth_token”
I do not have any issue with my steamguard or anything else, what’s the problem and how can I solve it?

Can you share with me the transaction ID so I canm try to provide further help?

Transaction is cancelled already since it took more than an hour, but I can share the both order ID and link of the item.

Order ID: 96e61c6a-7a51-4165-922a-5de185379323
Link: https://gameflip.com/item/the-andestian-sentinel/1caf6ab0-b3b0-48a0-bee6-7bba75be03e4