You entered the full set of recovery codes at once. You only need to use one, first unused, of the 10-digit recovery codes. Each code can only be used once, so you can generate a new set if necessary if you run out of codes.

I've removed the screenshot as it is not safe to post them on a public forum.

This is not the point, after scanning the QR code, the 6-digit code does not work and when you try to enter addons, it asks to connect it again and again, if you click to refuse, it does not let you into the office

After scanning the QR code to setup 2FA you need to enter a 6-digit code provided by an authenticator app on a mobile device to confirm that the app is working properly. If that code isn't working then it is possible that the app isn't compatible with Firefox. You can possibly scan the QR with your barcode scanner and open the authenticator app that way to see if that makes the app generate a working code.

You can try a different app or an extension in Firefox and compare the generated TOTP code.

• Authenticator https://addons.mozilla.org/firefox/addon/auth-helper/

I am using microsoft authenticator, which works

You entered the full set of recovery codes at once. You only need to use one, first unused, of the 10-digit recovery codes. Each code can only be used once, so you can generate a new set if necessary if you run out of codes.

Thanks a lot, It really helped, and for security reason, I have updated my 2FA code.