Help! Hacker gave me stolen Windows keys

[Windows Server]

Hello, This is really strange but a hacker hacked my Microsoft account and I changed my password and locked him out. Soon afterwards upgraded a Windows 7 laptop to 11. It said it was activated with a retail key. I never purchased a key in my life! I installed a few more copies of Windows 11 Home and 1 version of Pro. They all activated with retail keys linked to my account. I decided that when the hacker connected his computer to my account it linked all his stolen keys to my account and now they're in there for me to use. Is that where they could of came from? If so what should I do with

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