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Hello, thank you for reaching out to Microsoft Q&A.
Are the files missing from your OneDrive account?
In order to check the session activity in your Microsoft account, sign in to your account on the Recent Activity Page here-
https://account.live.com/Activity
If you notice any unusual activity in your Microsoft account, select 'This Wasn't me' to report the unauthorized access to Microsoft.
You may then be asked to secure your account by changing your Microsoft account password and enabling two-factor authentication for added security.
If you haven’t noticed any unusual activity on your account, please share more details about the issue you’re experiencing with OneDrive. For example, are files missing, or do you see any unrecognized files or photos in your OneDrive account?
Even though if you believe that your account may have compromised, you can try changing your account password first and then secure your account by enabling 2FA.