While I click on the whatsapp web from menu , it opens scanner but can't read the code. Why?
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We will need much more information to give good recommendations here. Please edit your question and include at least: The device you're using, Android version it is running. Also check and update the tags you've used to match your issue.– Tamoghna ChowdhuryCommented Dec 26, 2015 at 11:04
3 Answers
It is Most probably due to the bandwidth of either Computer or Mobile me too have faced the issue when i had a bad bandwidth as the WhatsApp web changes its QR in a very short period of time within which the Android should capture it and process it online I'll prefer you to connect your mobile in wifi and try the same :)
It could happen if you're using high contrast theme on Windows. If that's the case, then just set the theme to Windows Basic theme and it will work.
I regularly do it because I use black contrast theme.