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A code won't scan, a download failed, or something on the site looks wrong.
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A QRinst code or link that points to phishing, malware or other harmful content. Include the code's URL (for example qrinst.mdxtora.com/r/…).
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Before you write
Many common questions — about expiry, sign-up and static vs dynamic codes — are answered in the FAQ. If a code isn't scanning, try the QR checker first; it usually shows whether the problem is contrast, quiet zone or print size.