Sending, receiving, and organizing email in Outlook.com
Hi,
You can try checking if your browser is saving an old or incorrect password, clearing your cache and cookies, and ensuring that no other devices or apps are repeatedly trying to sign in with a wrong password, which can trigger lockouts; also, enable two-step verification for extra security and review your account’s recent activity to see if there are unfamiliar sign-ins causing repeated locks.
Are you mainly accessing your account from one device, or multiple devices and apps?
Kind regards,