The response I got was as follows:
"Correct. Line 6 License Manager has been discontinued. If you want to use your stand alone POD Farm license, then you will need to use a different interface. The reason is, the POD Farm first looks for hardware, if it does not see it, then it will not activate the license. You can still use the UX as an audio interface, but it will not activate the POD Farm license. I hope that was clear. Thanks, Ben"
So since the license manager no longer works, it doesn't matter that the UX1 is authorized in Line 6 central, because the UX1 is looking for license manager, and doesn't see Line 6 central at all.
The TL;DR is: SOL