You've deployed a Server Core installation of Windows Server 2016. Which is NOT a way to update the server?
Configure the server to use a WSUS server with Group Policy.
Run the following command: Net stop wuauserv %systemroot%\system32\Cscript scregedit.wsf /AU 4 Net start wuauserv.
Net stop wuauserv %systemroot%\system32\Cscript scregedit.wsf /AU 4 Net start wuauserv
Install the WSUS server role.
Run the following command: Wusa <updatename>.msu /quiet.
Wusa <updatename>.msu /quiet