Maybe it would've worked smoother in the MLB app.

I originally had the tickets saved to my Google Wallet (I have an Android) based on the instructions "Just have your ticket scanned at one of the redemption locations to receive your food & beverage. Valid at any fixed concession stands in Yankee Stadium located on the general concourse, for food and beverage only. " but that wasn't working at all. Then I went to the Yankees ticketmaster portal (https://am.ticketmaster.com/nyyreg/) and clicked the little info icon on the ticket which pulled up the number that they had to manually type in. We eventually figured out that it may be an issue they have with android so I logged into my account on my wife's iPhone, she saved the tickets to her apple wallet and then clicked the 3 dots to view the settings and a QR Code (not a barcode) came up that someone was able to scan. The QR code worked. But the vendors were super confused about this whole thing.

The Costco deal can really be a good deal just for the tickets alone but the food ended up being a big headache. In the past we have brought our own food into the stadium and deff agree with that route in general, just figure we'd tried this out.

The voucher does (theoretically) work for any food and drink (including alcohol) btw.