Last I checked XI authenticators won't work on XIV.

And if you have the smartphone one, it likely won't work if you go to a different region entirely as it's synced to your phone and the phone needs to work properly. I was actually advised against using it when I went to visit Europe(I'm American) on the WoW forums because of the way the apps work, since my phone will be unable to get signal there(US LTE bands aren't the same as EU, and my phone won't even work with a EU card).