If you still have questions about the validity of your ticket, call the Tickets line at (714) 781-4636 to see if they can look up the status of your ticket. If you need to purchase a new ticket, you can do so quickly and easily online or on the Disneyland app.
Also, can you use expired Disneyland tickets?
Unless otherwise stated, the amount paid for any wholly unused, expired Disneyland® Resort Theme Park ticket, except for special event tickets or tickets purchased from a third party, may be applied towards the purchase of a new Theme Park admission ticket at the current price so long as the new ticket purchase price …
Similarly one may ask, how do you scan Disney tickets on the app?
Just tap the ‘+’ symbol in the upper-right-hand corner. Use the “Link Tickets & Passes” button to add each ticket. You may do this by scanning the barcode on your theme park ticket or manually entering the number below the barcode.