I just went through something similar with an AF codeshare. As a Platinum, I purchased an upgradable ticket on CO to CDG and was using 40,000 miles to ugrade. My return was on an AF plane 3 days later (a long weekend trip). I was first in line for an upgrade, and sure enough...exactly 30 days prior to my outbound (on CO) OnePass called and confirmed my seat. The problem arose with the return......since it was an AF plane CO told me that had to wait for AF to release the upgradeable seats. I waited, & waited, finally about 1 week before my trip I happened to call CO and ask about my return upgrade, they told me it had just come in!--but usually AF waits till about 3 days before the flight just in case they can sell the seats full fare BC!!