Hello, thank you for reaching out to Microsoft Q&A.
Have you already set up your PC with a local account, or are you setting up your device for the first time?
The Windows Hello PIN security feature is specific to each device. So, it is possible that you may have created this PIN during the initial Windows setup.
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Go to Start > Settings > Accounts > Sign in Options > Windows Hello PIN > Click Reset.
Follow the instructions to reset your PIN and then add your Microsoft account to the device.
If you continue to experience issues, please share a screenshot of the page where you are currently stuck.