Hi,
First, I suggest trying the AI-suggested steps, and if the issue persists, try the following:
If you received a message saying your account has been locked when signing in, it could be due to activity that may go against Microsoft's Terms of Use. This is typically a security measure to protect your information.
To regain access, please visit the support article below, click the "Sign in" button, and follow the steps provided. Be sure to review the tips included in the article, as they can help improve your chances of successfully recovering your account.
If unsuccessful, you will need to fill out this account recovery form to regain access to your account: https://account.live.com/acsr
Microsoft takes account security seriously, so the recovery process is fully automated to prevent unauthorized access. Complete the form using a device and location you've used before, and make sure to provide an accessible email address.
Microsoft typically reviews recovery requests within 24 hours. If your request is successful, they’ll send instructions to help you recover your account.
Help with the Microsoft account recovery form: https://support.microsoft.com/account-billing/help-with-the-microsoft-account-recovery-form-b19c02d1-a782-dee6-93c3-dc8113b20c42
You can submit the form up to twice within a 24-hour period, so feel free to include any new details you remember each time until you recover your account.
If the issue persists, let Microsoft know by filling out the reinstatement form here: https://www.microsoft.com/concern/AccountReinstatement
Note: This is different from the account recovery form.
Microsoft Team will review the reason your account was locked. If they determine that you are the rightful owner, they will reinstate your account. Please note that they typically respond within 48 to 72 hours. Be sure to check your junk and spam folders for their response.