Collectible also valid as RTB for 2 tickets to M68 Philadelphia

"Please note that the conversion process of Collectibles into tickets must be completed at least 48 hours before the match to ensure processing and delivery. If this timing is not met, we will not be able to deliver any ticket and therefore your Collectible will no longer be convertible into a ticket to the match.

https://collect.fifa.com/redeem-ticket in order to fill the conversion form. A full guide is available here: https://collect.fifa.com/ticket-conversion"