My Macbook Pro 13 " 2018 has Apple ID blocked
Good afternoon. Ebay I purchased a Macbook Pro 13 "in 2018, but Apple ID has been blocked. The seller is not removing this computer from icloud.com. As a result, I can't use it. There must be a solution. Maybe if I send you the serial number, you can find out the previous owner of this computer data and notify him of the need to disconnect the computer from icloud.com.How can I solve the problem?
Thank you.
[Re-Titled by Moderator]