Managing personal Outlook.com account settings, security, and privacy
Success sign in here means they actually got into your account.
If they only entered the correct password it would say unsuccessful sign in and details would say “request denied”.
2FA can be passed here for two possibilities
- Your Gmail is also compromised. They couls accesss your code and then delete that email.
- They stole what’s called a token session. Usually through unsafe link you clicked on and then allowed them to steal your token session, so their device can be seen as trusted and already authorized.
I will strongly recommend that you change your password and set up passkey instead for 2FA.