How to restore the built-in administrator from Microsoft account to local account?

Hi all,
I just updated to Windows 11 Pro a HP ZBook Fury 15 G7 laptop I just redeemed from my company and delivered with a "clean" installation of Windows 10 Pro with the sole account of built-in administrator.
While peeking around in the new Windows 11, I did a great stupid thing: I absent-mindedly changed the built-in administrator account I was using from local account to my Microsoft account.
The problem popped up immediately after, when I tried creating a normal User account with my Microsoft account, as it's safe to do for daily use: the system prevented me from doing so because there was already an account connected to my Microsoft account!
My request is very simple: is there a way to restore back the built-in administrator account to local account, so that I can proceed to create a new User account linked to my Microsoft account?
Thank you so much in advance!

Settings >Accounts switch to use local account.

Thank you Jockey, nice try... but, as I noticed horrified immediately after switching the built-in administrator account from local to my Microsoft account, there's no such option in the Accounts setting windows for the built-in administrator

There's a Hidden Administrator in Windows that usually is never unhidden except when having major issues and does not have a password.

After setting up a Microsoft Account with Admin rights I like to add a New User as a Local Account with Admin rights, name at least one character different and not an E-Mail name. Then I Sign out [right-click of the Start button] then reboot to get both Users on the screen and pick which I want to use. It's also possible to be logged in as Local and remove any other visible account. Sign out, or log off, is different from Reboot which only brings same user back.

The hidden administator account is meant to be a troubleshooting tool only and not to be used as one's daily used account. It is hidden for a reason. I say all that for anyone who reads this thread as it seems you are aware of why it should not be used. Since there is no peronal data on the machine I suggest you do a reset using the "remove everything" option. This willl put the machine back into OOBE condition, recreates the hidden account, and will allow your to set up your account during OOBE.

Hi, welcome.

When you install Windows, Windows creates a user account and by default it is an Admin account.
The Admin account and the Built-In Administrators account are two separate accounts.
The Built-In Administrators account does not show by default
The Admin account created by Windows after install, does.
Note: You cannot change the Built-in account to a local account

This is how you access the Built-In Administrators account — with some information on how to manipulate the Built-In Administrators account.



Also

• Add Microsoft Account in Windows 11
• Add Guest Account in Windows 11
• Add Microsoft account to Local account for Hybrid account in Windows 11
• Change User Account Name in Windows 11
• Change Account Picture in Windows 11
• Enable or Disable Account in Windows 11
• Check Account is Local Account or Microsoft Account in Windows 11
• Check Account is Administrator or Standard User in Windows 11
• Update Security Questions for Local Account in Windows 11
• Enable or Disable Use of Security Questions for Local Accounts in Windows 11

open command prompt as admin and run
and post a screenshot

Also - try this reg mod
.https://answers.microsoft.com/en-us/windows/forum/all/how-do-i-change-the-primary-microsoft-account/f2023740-c720-4126-81d6-5d22fd9dae0d