Based partly on reading this thread, I decided to call Costco about a day we were unable to use on a Go Oahu card we bought at Costco as a result of everything being closing during the recent hurricane in Hawaii. They said I had to call the card company. When I called they card company, they said they would normally give us a credit. But, because we bought the card at Costco, they couldn’t do anything. I needed to call Costco.
I’m not unhappy because we had 3 great days using the card and no one is responsible for a hurricane. But, I was a little surprised based on this thread.
Card was activated and used. So I think that is on Go Oahu. I bet they would give you a discount on next purchase if you politely escalate your issue.