RESOLVED: In my case, for whatver reason, the experation date on my card in my Wallmart wallet was wrong. It's the default card in my account and I've used it many times. Have no clue how it was changed, but I updated it and the card now works at Walmart.
RESOLVED: In my case, for whatver reason, the experation date on my card in my Wallmart wallet was wrong. It's the default card in my account and I've used it many times. Have no clue how it was changed, but I updated it and the card now works at Walmart.