Delta flyer here who occasionally flies United. Question for the group: why is it so darn hard to use multiple United credits on one ticket? At Delta these are known as eCredits and they can easily be combined and redeemed online or in the app like any other form of payment. I have never had success redeeming two or more United credits in the app or online. Even calling results in multiple hour calls with agents who can’t seem to combine them in any sort of reasonable time frame before I inevitably lose the call. They also want to charge a $25 convenience fee to do what’s impossible to do online. After a few phone attempts I tried going to my local airport and asking at a United counter but they said they don’t issue tickets using credits either. Am I missing something?