since 2010 you can retrieve activation codes directly here:
if it really doesn’t work there, you can contact us (please allow about two days for the answer).
you do not need to “activate” or “register” every coin here before you do on groundspeak. some few other geocoin brands/designers require(d) you to do this – we don’t, never have and never will.
note: following letters will most problably not appear in the second part of tracking code: I, L, O, and U. most likely, those are the numbers 1 and 0 which can be easily confused with I and O.