The QR code is generated on PC but Android app says:
“QR Code could not be read”
Is this a bug?
Can you read the qr code with a different app? For the app password it should include a link like: nc://login/user:username&password:PWSTRING&server=https://nextcloud.example.org
Either the generated link in the QR code is wrong or the app has a problem reading qr codes.