Problem:
When you add a Managed Account:
Explaination:
The declared account during configuration wizard run the SharePoint Timer Service. This account need local admin privilege.
Even with this error message, the account is added. Nevertheless, if you try to go to the Managed account page from central admin, the page doesn’t work anymore (Object reference not set to an instance of an object):
So you have to:
- Remove the added account through PowerShell : Remove-spManagedAccount -identity mydomainnewaccount
- Add the timer account local admin
- Restart SharePoint Timer Service so it get the privilege
- iisreset
- Add again the account.