If you entered an authenticator code in this session within the last 30 minutes, for example when signing in, you are not asked again.
Otherwise, a Security verification required window opens when you confirm the withdrawal. Enter the 6-digit code from your authenticator app and select Verify and withdraw. You stay signed in, your withdrawal details are kept and the same request continues. Recovery codes can't be used here, and the window closes after 5 minutes.
If you cancel or the window expires, nothing is sent: review the withdrawal and confirm again. If two-factor authentication is off, turn it on in Security first. If a code is refused, wait for the next code in your app.