I booked MUC-DEN in First(O) with LH for 80k. On the Aeroplan site it's showing the ticket as Economy (O). Is the ticket still first or do I need to call in to LH to confirm? I haven't been able to view the reservation on Lufthansa's site because it was booked Aeroplan.
Should be fine. To confirm (and do seat / meal selections):
Call Lufthansa, give them the Aeroplan e-ticket number and they'll give you their PNR. Technically you can call Aeroplan and ask them for the LH PNR, but their hold times are usually much longer.
MUC-DEN is only 70k OW in F btw.