These are user-supported, public communities and Apple product teams do not participate here.
I can generate a QR code on my Mac that is a URL to the Mad magazine site. I then use Quick Look to open a larger view of that .jpg image and point the camera of my iPhone 15 Pro Max at that QR code. When the camera identifies the QR code, a yellow lozenge with the name madmagazine.com appears at the bottom of the camera screen. Clicking that opens the iOS Safari browser to that URL.
Maybe you need a newer phone or a dedicated scanning app that identifies other forms of QR codes. I use QRBot from the iOS App Store for other codes. My iPhone 13 Pro Max and iPhone 14 Pro Max both behaved identically to my iPhone 15 Pro Max running iOS 15 or 16 with this on-screen QR code URL test.