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Hi,
Your account has likely been blocked due to multiple failed login attempts. This is typically a security measure to protect your information.
When your account is blocked, Microsoft provides instructions on how to unblock it:
If unsuccessful, fill 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.