Register Managed Account: Access Denied – SharePoint
To Register a Managed account, went to: Central Administration >> Security >> Configure Managed Account >> Register Managed Account
Central admin returned the error: An error occurred while getting information about the user
Solution
To solve this issue, you need to add the account using PowerShell! Logon to your server using an account from your internal domain (you need to do this so it can retrieve the info it needs from this domain)
Execute the below commands in PowerShell:
$credentials = Get-Credential
Now in the login prompt, enter the managed account details
Now, Enter:
New-SPManagedAccount -Credential $credentials
That’s it. Now the new Managed account has been added