- Make sure that the QR code is scanned from the WhatsApp application (WhatsApp Settings → Linked Devices → Device Binding), and not from a regular camera or from third-party applications.
- Make sure that the latest version of the WhatsApp or WhatsApp Business app is installed.
- Check the phone's camera to see if it is dirty, and wipe the lens glass(s) if necessary.
- Turn down the brightness of the monitor to avoid glare.
- If the weather is sunny, close the curtains or blinds to avoid glare.
- Try manually increasing the sharpness if there is such an option in the camera settings.
- Check the list of related devices (WhatsApp Settings → Related devices), if any– temporarily delete them.
- Make sure that your internet connection is stable:
- open the browser on your phone and go to any website. If the page is open, the Internet is available.
- check if VPN, proxy services, and ad blockers are disabled.
- if you are connected via Wi-Fi, try restarting the router, if it does not work, try to connect using the mobile Internet (LTE).
- If you are using LTE, try connecting to Wi-Fi.
- try to scan from another phone, and then you can immediately unlink the session.
- if the application where you are scanning the code is running in a browser, make sure that the current version is installed and try using another browser.
- If nothing helps, contact the provider's support service. You may be hampered by technical problems that cannot be fixed on your own.