Web WhatsApp login not working (FP3, Android 9 [Pie])

Thanks to all, and especially to alex21.

I could not only solve the problem but also find its cause:

The QR code was in the wrong angle. The solution does not require any additional software, it’s fully sufficient to turn off auto-rotate for a moment, and to scan the QR code in landscape mode.

Kind regards
modirawatleng

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