While it's not really relevant to the computer question, we have a neighborhood garden with a number of plants. They have a small marker identifying the name of the plant but I thought I would add a QR code with a link to the Wikipedia article, so people can easily look up the information. It works for androids but at the moment not for iPhone and I'd hate to install these and not be respectful of iPhone users. I'm sure that iPhones can read QR codes so not quite sure what's wrong.
I happen to create the code using Microsoft's QR generator:
https://www.microsoft.com/en-us/p/qr-code-generator/9pb220q9nzzr?activetab=pivot:overviewtab
In case that's relevant. I find it difficult to believe that Microsoft would create an app that creates codes that don't work for iPhone users but who knows?
Phil