Walgreens update-heads up

I have heard that the $5 Walgreens coupon is not working for everyone. It says on it any oscillilium flu product, and the kids one is the flu one, so not sure why it isn't working. People have said it beeps when the cashier scans the coupon. Mine did not for it, but maybe it was working yesterday morning, and then the changed it? Not sure, but just a heads up to everyone