Wallet “Scan Code” doesn’t work

I'm trying to add a website QR code to my Wallet. I open the Wallet, click “Edit Passes,” and click “Scan Code,” the Camera opens, and I point it at the QR code. Camera recognizes the QR code and offers to open the website in Safari, but not to add it to my Wallet. If I do open it in Safari, there’s no way that I can see to add it to my Wallet. If I switch back from Camera to Wallet, with or without taking a picture of the QR code, Wallet goes back to square one without adding the “pass.”