My new pc stopped working after Windows 11 updates

[Windows 11]

My new pc stopped working after windows11 update,. It just wouldn't restart. I have tried for hours to mend it and eventually found I needed a bitlocker key. My microsoft account says there is no key for my new device which was set up just a few days ago. Please, any suggestions? Tried turning off and on and followed all the prompt for hours but it seems its the bitlocker thing that's upsetting it.

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