Potential issue w/ google auth qr code generator & required fields

[SignpostMarv]

At the time of writing with some very brief tests with the plain text encoder, it appears that the google auth app doesn't like qr codes that lack a username.

            $output->writeln('FIDOU2F QR Code:');

            ob_start();
            (
                new GoogleAuth(
                    $two_factor_auth_secret,
                    TOTP::ObtainInstance(time(), 30)
                )
            )->makeQRCode(
                new Writer(new PlainTextRenderer()),
                'php://output'
            );

            $output->write(ob_get_clean());

p.s. going to make some qrcode-related changes shortly.