OP might confirm this, but since the 21 days ticket includes water parks and hopper, you're not supposed to be allowed to upgrade it to a regular AP, you need to go for the PAP
There are some exceptions, but I think OP would have had a story other than "it took 10 minutes" because upgrading from ultimate tix to standard AP often requires lots of sweat and manager intervention
Anyway I'm still waiting for the OP's answer, as I'm quite willing to upgrade my 21 ultimate tix too once I'm in Orlando
Another question to add : Did you use your ticket before upgrading ? and if so, what did you use (number of days, WP, hopped ?) ?