The right to transfer your ticket on a game by game basis foc is built into the contract (8.2), as is the right to sell it via the official ticket exchange available to all (8.3), but the online facility to transfer to another person other than via the official exchange (when that has been...
I can’t remember which game it was when I had to use it, but it was several months ago, and it didn’t work for me either. I gave 1901 a call and they sorted it manually for me.