Didn’t you recently argue in favor of 2FA across the board?
What a joke.
Example:
Just google it. One funny issue that they used to have (when I first evaluated it in 2013) was that if you lose your Android phone that’s not backed up to mothership, you’d lose the ability to gain access your 2FA (or perhaps “2F-ed-up”) accounts.
Gotta love it when the proponents of decentralization recommend 2FA!
There’s nothing you can do now, because you don’t control that address.
Just contact MasterXchange support, I think they’ll be able to get it out for you.