This thread is inspired by another: view original post
The Taken King is required to purchase Rise of Iron. Based on your original post list of purchases (Base game and expansion pass), you do not own TTK. Purchasing the credit from GameStop gives you a console credit, which allows you to purchase the expansion digitally on your console. However, you must meet the TTK ownership requirement, and TTK must be owned on the account you are purchasing RoI with. If you have never purchased TTK for your account, Destiny the Collection contains all of the content you need, including RoI.
Edited by Blump: 12/19/2016 12:33:48 AMDo you own The Taken King on the same console account you are trying to purchase RoI with? Edit: Damn you autocorrect!