I’ve copied this from the ticket page
We received an allocation in the East side of the stadium of just over 30,500 tickets, which includes all accessible tickets and a small number of restricted view seats.
Applications were accepted until 9am Tuesday 9th May from all Executive Club Members & wheelchair user Season Ticket holders, and Full Season Ticket holders (including amenity) who have purchased all home cup games and applied for the Emirates FA Cup Semi-final.
We have managed to secure additional tickets for this game and will accept applications from Season Ticket Holders who purchased all home cup matches but did not apply for the FA Cup Semi-Final. Applications are open until 8am Friday 12th May – with the ballot being processed by Monday 15th May. All supporters who applied in the original ballot will be successful pending payment, which will be processed over the coming days.
We were oversubscribed with applications from supporters with accessible needs, and Executive Club Members.