Windows 10 Can't enter Windows 10

[DonaldCooperNC]

I'm trying to clear an old computer for resale. On start-up, an obsolescent phone number appears. I don't know the requested password and can't go further. I am offered the alternative of entering my Microsoft password. Although I enter the current MS PW of my account with certainty and accuracy I get an "Incorrect PW" response. I then change my MS PW on a different computer and yet it too is rejected on the troublesome one. I don't know how to proceed and would be very grateful for any assistance.

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