Try using Javascript action. See stackoverflow here: https://stackoverflow.com/questions/33175909/copy-image-to-clipboard
Regards,
Ronald
It is not giving an error but its giving message 'Please generate a QR code first'.
Because It is not storing anything in var img below:
var qrcodeContainer = document.getElementById('qrcode');
var img = qrcodeContainer.querySelector('img');
However qrcode is already stored in a system.image object as qrcode is downloading correctly in microflow.