Windows 11, cannot change user permissions

[Jesper P]

Today, I pressed Win+R and entered 'netplwiz'. After opening the User Accounts, I changed my account's group from Administrator to Standard.When I tried to click on 'properties' again and adjust the group membership to 'Administrator', the system displayed the following two error messages:1. the user could not be added because the following error has occurred: access is denied.2. the group membership for [username] could not be updated.I tried to solve the issue following the method from this article: https://answers.microsoft.com/en-us/windows/forum/all/windows-11-cannot-change-user-permissio

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