Was my account hacked and was any One Drive file content illegally downloaded/transferred/copied and taken by hackers?

[Windows 11]

Hi, received an email alert showing an unregistered sign in to my account 9 Feb 4.44am. If accessed, are you able to confirm what info was reviewed and was any info specifically my One Drive files viewed, downloaded/transferred/copied and taken by hackers? Thanks, SJ.

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