Managing personal Outlook.com account settings, security, and privacy
Hello, thank you for reaching out to Microsoft Q&A.
Did you try clearing your browsing History, cache, and cookies if you are signing in with your Microsoft account on Outlook.com online?
Click CTRL + H to open the browser's history > Click clear browsing data > Delete history, cache, and cookies.
Then, restart your browser and sign in with your correct password.
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If you are still having issues, try signing in with other methods.
That is, on the screen where it asks you to type in your password, select 'other ways to sign in' and get the verification code on your alternate email address or phone number.
See if you can sign in to your account at least.