Originally Posted by
Polytonic
So after some problems with AC IT, at least two of my P-segments miscredited to Aeroplan. Seems I will have to call in, pray they can reverse the credit, and then have MPSC claim the credit instead (and then maybe retroactively give me 1K and RDM for flights I have booked in early January). I suspect I won’t actually qualify for 1K until after I get all this sorted it several weeks into next year.

Don't count on that happening. Plenty are reporting such issues when one has an AC and a UA account. Bes of luck in your endeavors, but I'd definitely look into plan B.