To resolve the issue where your Touch Hub QR code returns an unsupported error, follow this step-by-step troubleshooting guide:

1. Check the QR Code Quality: Ensure that the QR code is clear and not pixelated. Blurriness or distortion can prevent proper scanning. If necessary, print a new, high-resolution version of the QR code.

2. Adjust Your Scanning Angle: Alter the angle and distance between your camera and the QR code. Position the code at an optimal distance for scanning and make sure your camera is level with the QR code surface. This can significantly improve the scanning success rate - learn more.

3. Clean the Camera Lens: Sometimes, dirt or smudges on your device's camera can affect scanning capabilities. Wipe the lens gently with a soft, lint-free cloth before attempting to scan again.

4. Turn Off Unnecessary Features: If you're using any VPN, proxy, or security apps, disable them temporarily as they may interfere with the scanning process.

5. Use Different QR Code Scanning Apps: If the built-in camera app isn't working, try using a dedicated QR code scanning app. These apps might handle certain QR codes better than others.

6. Restart Your Device: A simple restart of your iPhone can resolve software glitches that might be preventing the QR code from being recognized.

7. Update Your iOS: Ensure your device is running the latest version of iOS by checking in Settings > General > Software Update. Sometimes, updating your device can fix scanning issues.

8. Verify the QR Code Content: Confirm that the QR code you're trying to scan is currently valid and not expired or disabled. Sometimes, QR codes can direct to outdated links or campaigns - learn more.

Following these steps should help you address the QR code scanning issue with your Touch Hub. If problems persist, consider reaching out to Touch Hub support for further assistance.