Troubleshooting a QR Code that isn't working
We check every QR code before we ship our tags and signs to ensure our codes are working properly and we keep a digital proof of the tags to check them as well.
When someone contacts us that one of our QR codes appears to not be working, we have always been able to resolve that the issue was actually related to their device, an internet connection, the camera on the device or the QR reader they downloaded for their device.
One of the problems with scanning a QR code is that free apps that are available to read them vary greatly. There are a lot of old, really poorly built apps available in the app stores today.