Must be a new feature. Seems to have an issue when you try to continue after calculating the cost.
I got past there. Do you have enough points?
Even with enough points it doesn't seem to let you ticket it online.
Most carriers do that on *A and OW as well.
Higher yq ex USA than ex Europe, even for a RT
-1. They have yq in fare just don't charge it for awards (even ex LHR, though you have to pay APD). KA does.
Delta does charge YQ on awards beginning in LHR, besides for APD.