My Mac is in Activation Lock, and I do not know the iCloud acount it is asking for. What should I do about this?

You have encountered activation lock. Only the owner of the account that was signed in and used to lock it can remove the activation lock.

Contact whoever you got the Mac from.

If you are the original purchaser of the device from Apple or an authorized retailer in the US, Apple can remove the activation lock if you can provide the original proof of purchase.

What can you do now? Accept the fact that you have an Activation-Locked "brick."

By your own account, it is locked to someone else, and you do not have the credentials to remove the lock, nor proof that you are the legitimate owner. Nor, it seems, are you willing or able to enlist the help of whomever sold it to you. You cannot remove the Activation Lock, we cannot, and Apple will not. Activation Lock is there to stay.

manuka144 wrote:

I dont hove anything for authorized documents 😢😢 what can i do

Return the Mac to the seller to fix things or give you your money back – if you can contact the seller, and believe that it's safe to do so.

If the Mac is Activation Locked and the seller has conveniently "disappeared", that might tend to suggest that you bought a stolen Mac, and that Activation Lock is doing exactly what it is meant to do.

manuka144 wrote:

Im in sri lanka 🇱🇰 , we are not have the Apple Store,

Activation Lock is an anti-theft feature, and absent convincing evidence that you are the rightful owner, Apple will not remove it. "I have a computer from a foreign country, that's locked to someone else's Apple ID, and no proof that I am the original purchaser and rightful owner" is not exactly a scenario in which they are going to remove it. Whether there is an Apple Store in your country, or not.

manuka144 wrote:

Apple a send me case file- and case number - and there said to me investigation the case and more details but not yet happened

If the facts of the matter are as you have outlined to us, you wasted Apple's time by submitting an Activation Lock support request – and you should have known that when you submitted it.

Do not expect them to approve the request.

This is a user forum.

You are NOT talking to Apple.

If you do not have the original proof of purchase for the machine from an authorized retailer or directly from Apple, it is a boat anchor.

There is no way to bypass the activation lock.

The All Too Common SAD Reality of Buying a Used iPad/iPhone – Apple Community

Written with iPhones and iPads in mind, but some of this applies to used Macs, as well.