Budweiser digital rebate debit cards

Long story short, I got a $5 digital rebate debit card and it added fine to my Apple Wallet on my iPhone, however I can't get it to work at the checkout. Bud used to send a physical debit card for rebates and the PIN would be the last 4 of the card. I tried that with the digital card and it came back unauthorized. Is there a default PIN for all cards or is there somewhere to look it up? Thanks