For me, the site used to work until about December. Since then it normally won't work, no matter how many times I enter the card number. Once in a while it still works.
Even worse, when you call the 800 number you can request a link sent to your cell phone that will show the card's activity. The last 2 weeks even the link they send my phone no longer works. Sheesh.
BTW, it isn't "Kroger's" website, it is US Bank's.