Hi,
Your account cannot be blocked simply for not using it for one month. It has likely been blocked due to suspicious login activity, multiple failed login attempts, or sign-ins from unverified devices or locations. This is a security measure designed to protect your information.
If none of the solutions provided by the AI above resolve your issue, as a last resort you will need to use the account recovery form: 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.