log on error with MacBook
why can't I use my Apple ID to login on my new (second hand) MacBook?
MacBook Air (2018 – 2020)
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Are you certain that the previous owner properly prepared your MacBook for transfer to a new owner? Did you purchase this MacBook from an individual or somewhere else?
The seller would have needed to do the following before you received it:
What to do before you sell, give away, or trade in your Mac - Apple Support
If they didn’t do the above, you would need to contact the seller to make sure they are completely signed out of the device and Find My is turned off.