Just to add to the above, you have to have tickets for each day that you want to make FP+. For example, for 5 days of FP+, you have to have at least a 5 day ticket.
Also as I just found out this past weekend, you need to give the system a few minutes to update, after you link your tickets. I tried to book my fastpasses as soon as I linked my tickets and the system did not recognize that I had tickets yet. I did something else for about 20 minutes than tried again, and everything worked fine.
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