I am trying to do online checking on Lufthansa's website for a flight I purchased with Aeroplan miles. I've tried it using my Aeroplan card number and I've tried it with my Lufthansa booking reference. Every time, it says it is unable to locate a valid ticket for me. It gives me a number to call (their online technical support), but they have ridiculously limited office hours (10-6 EST M-F). Has anyone else had trouble doing online checkin for Lufthansa?