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Hi, thank you for reaching out to the Microsoft Q&A forum. I’m happy to help.
Based on the information provided, it is likely that your account was hacked and the hacker changed your email address. If the hacker changes your email address and other account information, recovering your account can be challenging, and it may even be permanently lost. I understand that this is a difficult situation. You can check the Microsoft article below to see if it may help.
The link provides comprehensive steps to recover a hacked account and also gives you the option to chat with Microsoft Support as a last resort.