As I recall I first saw the ability to add the UPS CC after my iPhone 12 Pro was in Anchorage, or in Louisville. I did keep searching for it all week and suddenly it was included in the list.
Right now UPS CC is definitely not showing up as an option in neither the app nor in My Choice web page.
I do see some things have changed since just 3 weeks ago, including charges for changing delivery to a UPS Access Point. And My Choice Premium has gone from $40/year to $20/year, hopefully that pays off in a free change when I can finally change my pickup to the CC.