It's kinda complicated story.

I work in customer care for one of the many ground handling agents in TG's vast network of cities.
This person checked-in one day for a TG flight holding a MP redemption ticket.
The ticket says fuel surcharge is not paid yet.
We can't let him on board until he settles it.
We checked with the UA station manager here and confirmed it.
He eventually paid for it.

From what I have been reading here, UA does not charge fuel surcharge for award tickets.

So I am now very confused. I haven't been able to find related information on UA.com and since I am not a MP member, I can't go in and price out an itinerary.