Originally Posted by
parrotheadmjb
The AU card will have the primary account number but you can't make a reservation under a different name than the account name unless you're a globalist and using points. Only way around this is what people above mentioned. You do put your explorist status in jeopardy by doing the work around, they can cancel your account and your sister might not be able to access the room. With that said I think it's pretty low risk though.
Ah, gotcha, that makes sense - thanks! It may be worth adding her as an AU just for incidentals and purchases while at the hotel.
And just to be sure - the "second guest" thing is a better way to do it than to change the name on the reservation via the website after booking under mine? Would it no longer be linked to my WoH account number?