Hello there,
Is this your personal or work device?
If your device is managed by someone else, such as your IT department or a different owner, check with them for the password.
Forgot UEFI password for Surface https://support.microsoft.com/en-us/surface/forgot-uefi-password-for-surface-e44d979a-7d85-4108-98d0-6bce7d421046
If not you have to reimage the device back to it's default settings so you can have it operable again. How to use Surface UEFI https://support.microsoft.com/en-us/surface/how-to-use-surface-uefi-df2c8942-dfa0-859d-4394-95f45eb1c3f9
Hope this resolves your Query !!
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