Cannot setup iCloud account for Mac Mojave installation - unknown password - never created by me.

Attempting to create iCloud account for Mac mini [Late 2012] upgraded from High Sierra. To Mojave, I am comfronted with the below message. I have no idea what password is required. I have only password associated with "(name)" - is there a work-around for this?  When/Where would I have created/used this password?

Enter the password you use to unlock “(name)” which is not the password for this Mac mini. --- ??

Enter the password you use to unlock the Mac mini “(name)”. Your password is encrypted and cannot be read by apple - worked OK
MARSPATHRetired EE/Computers/ITAsked:
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Owen RubinConsultantCommented:
Often you are asked to enter your password for your Apple account. Do you recall having created an account at any time? Typically you would need this account to do the upgrade or use iCloud.

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MARSPATHRetired EE/Computers/ITAuthor Commented:
Now confusion keeps the upper hand...

I installed MacOS Mojave on another Mac mini (late 2012) on the same LAN and the connection to my iCloud account connection is not an issue, that is I can access my iCloud account files OK.

>>> Do you recall having created an account at any time?
Yes, frequently used.

Seems that failed iCloud login is fixed when enough failed logins return request for iPhone access code which allows access to iCloud.

Owen RubinConsultantCommented:
You might have to delete the iCloud account from the computer causing issues, and then add it back again. Sounds like your account is OK and the password is right.  I wonder if the stored value in the keychain is wrong. I also suggest you do a change password on the good machine, confirm it works, and then try that on the first machine. And you can always try a keychain reset, but it really tosses away all your saved passwords and security certificates so you will get lots of requests for your password as you accept that data again as you use the computer.

I get several calls a day from people having trouble logging in on some machines. Apple’s security can be a real pain, especially if you have two factor authentication turned on. I forgot to ask you about that.

No accusations intended here, but are you the original owner, or did this belong to someone else before you? It is possible the machine was never released from the previous owners account, which can also cause login problems.
MARSPATHRetired EE/Computers/ITAuthor Commented:
>>> You might have to delete the iCloud account from the computer causing issues, and then add it back again. - I will keep this in reserve.

>>> especially if you have two factor authentication turned on. - I do

>>> No accusations intended here [none taken], but are you the original owner - yes, several years ago I abandoned WIN 10 for macOS Sierra.

Thanks very much indeed! I do appreciate the insight to these troublesome login problems.
Owen RubinConsultantCommented:
No problem. These are guesses because I am not at the computer and cannot observe what is really happening. So these are just some ideas in hopes they work.  Do report back.
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