They used to show in my account, but the Upgrades button has disappeared from my Profile page. When I called Copa to ask, the CS Agent told me that she could see the certificates in my account, and I could use them if I called the airline to apply them. But I still can't see them in my account. I am also not sure if they can yet be used on flights operated by United.

I'm planning to fly SFO-PTY-AUA in October, so I'll find out pretty soon if my certs actually exist!