Impossible
I have previously done this! How, you might ask how? I have a credit card with $125.00 travel credit that can be used with the United Travel Bank website. It’s simple, when I purchase the United Travel Bank travel credit, there’s an option to send the travel credit as a gift, to someone else’s (i.e. your) United travel bank. I’ve done it multiple times, and it works every time. If you have a United Airlines' frequent flier number….you also have a United Travel Bank account, which is viewable on the United Airlines website, when viewing “wallet”.
Bottom-line: I’m selling $125.00 of United travel bank fund, to be added to your account, for $100.
Best wishes,
Terence (tjcabq)