If you forget your Microsoft account password or it just doesn’t work, and you can’t access your recovery phone or email, start the Microsoft account recovery process. Start to sign in to Outlook.com but click the “Forgot password?” link. Provide as much information as possible to prove your identity. If unsuccessful, you may lose the account. Keep your recovery info current to avoid this situation.

https://www.helpcentertips.com/blog/recover-old-microsoft-account