PGGEveryday website rewards OTC Payments

Where do you all get yours from and it actually works? Meijer was my go to in self checkout, sure you’d have to try a few times to get it to work but it didn’t involve cashier like it does at Kroger. Now, at Meijer it makes the Cashier sign in to the self checkout if it doesn’t take. I had a cashier last month tell me not to do that through self checkout because they don’t have time to assist me constantly as they have other customers. It did the same thing tonight. Went to a cashier and she couldn’t get it to work and said after 2 times she isn’t going to try anymore. Is there anywhere your OTC always works without an issue even if it is through regular line? TYIA!