Hrm. The fount of all knowledge [1] told us that all staff had been empowered to do an AUP (and swipe the customer's payment card) awhile back - a tiny foretaste of the all-staff-doing-all-ticketing discussed elsewhere. Are these particularly un-knowledgeable staff (I can well imagine someone being put to work without having finished all the ticketing / AUP / etc training), or a lack of inclination, perhaps even hardware failure, or some other reason?

(If a staff member knew the card reader at their station was broken, they would genuinely not be able to AUP them there).

[1] c-w-s