Log-in with QR code is only available on Android, as Apple rejected it for "circumventing their ecosystem". After you've clicked "Log in using a QR Code" and have clicked "Scan QR Code" (and the QR code scanner is open), head to your account. (https://interlib.munsci.org/account/user)

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Click "Generate QR Code" and you should see a scannable QR code to scan.

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This has to be done through the app! Scanning the QR code using just the camera app will result in an error.