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Hi @Long Tran Dinh Duy ,
as a first step I would recommend you to use the Microsoft’s Account Recovery Process:
Go to the Microsoft 365 login page and select "Can’t access your account?" Follow the prompts for business account recovery, which may include verifying via alternate email or SMS.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Best regards,
Jonas