Add service account as a login for my database

Hello,

I am expering difficulties to add my "local system" account as a valid login for my SQL (localDB)\v11.0 development server.

This is my development environment where I am creating a windows service that will run in a "local account". As this server will have access to the database using integrated security, I believe I have to grant access to this account to the database.

The problem happens when I go into Management Console and ask to add a new login name (Windows Authentication).

I tried to use NT AUTHORITY\NETWORK SERVICE .\LocalSystem and many other, but the user is not found.

I am running windows 8.1 pt-BR and would like to find what how can I do that?

Regards,

Igor.

.NET Software developer for industrial internet and automation system.