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Hi! My name is Aj and Im an Independent Advisor here to help! Im sorry to hear about the account. The account might have suspicious activity thats why it is placed on a security hold and during this time you cannot sign it. I would suggest to submit an account the recovery form at https://account.live.com/acsr and enter the original email and fill in as much info as possible, like old passwords, subject lines of emails, or payment details for services like Microsoft 365 or Minecraft. This is how Microsoft verifies you are the rightful owner. The minecraft account is also tied to microsoft account so you can only access it once your pass the recovery form. After submission please allow 24-48 hours for verification.
If the form says the account is not recognized or you cannot get through, then you need to go to the support page https://support.microsoft.com/contactus. Select "I cant access my account" and then choose "No" when asked to log in. That will guide you to chat or request a callback from Microsoft support.