By logging in with two-factor authentication, you increase the security of your account, as it requires an external authentication via app or hardware key. This means that you not only enter your password when you log in, but also use a security key or authenticator app depending on what you choose. There are two options to choose from, security keys or authenticator app.
Authenticator app
When you log in and have a authenticator app active you are greeted with this message:
What you then need to do is go to your authenticator app and look for this code. It can be, for example, Google Authenticator, Microsoft authenticator, Authy or 1Password. It's up to you to choose which app you use when you enable two-factor authentication
If you cannot find this code, one of your colleagues can restore this for you. Then they follow this guide: Reset two-factor authentication
Security keys
When you log in and have a security key active you will have to sign with it. This can look different depending on what type you are using.
If you have Touch ID on MacOS it can look like this: