I've installed magneto 2.4 and enabled 2fa following the instructions in this link https://devdocs.magento.com/guides/v2.4/config-guide/deployment/pipeline/example/cli.html
I don't understand what I should be doing on the third step: magento/tfa/OTP_SHARED_SECRET=
and after logging in using admin account I don't get QR code to scan. am I missing something here?