Si I had this same problem recently on a CM itin. UA Plus Points have become useless for attempting to upgrade on CM it is a total waste of my time to even call. The website throws an error message so we cannot know why it does not work (no Z available or just website malfunctionality). We call UA web support and they can do nothing except tell us Z is not available. Which Copa then denies! But they are correct that this is UA's issue and CM cannot know why UA's system fails to interface.

For years UA had the best upgrade systems and paths using MP instruments but the recent downgrades of benefits and even of previous regular functionality like working online upgrades is turning MP into one of the worst. It is remarkable how fast it is decaying and how bad the experience now is. En primera as always it was DL and I quite on them years ago. Then AA, now UA.

Soo I am following the new path of qualifying for CM status by crediting all Star flying to CM except long UA flights. The only reason for me to credit to UA is now for more lifetime status but I do not expect this goal will remain at the same level before I qualify (have 1MM already but I need 0.7MM more to reach 2M and those benefits are not greatly more than current levels).

I think that many people are following this plan. Because at the Clubo Copa last week, I used MP card to access and the agent said, ah you are getting millas with us (CM) and I say, Si! Es mucho mejor ahorra. I think I am not the only one who he sees doing this.