Login failed for user in Windows Authentication mode

When connecting the SQL Server Windows Authentication mode in Bold BI, it will throw the following error

Why this issue occurred

NT AUTHORITY/SYSTEM is not added in IIS/IIS EXPRESS to access SQL Server Windows Authentication mode.

The steps for adding NT AUTHORITY/SYSTEM to access SQL Server Windows Authentication mode in IIS/IISEXPRESS

In Microsoft SQL Server Management Studio, do the following in the Server.

1. Right click on “Login” and select New Login to add respective login into SQL Server.

2. Click on “Search” button, then select Advanced -> Find Now -> SYSTEM in the newly opened windows.

   

3. Then click “OK” to add the login NT AUTHORITY/SYSTEM. Once it was added, we can able to access Windows authentication mode in Bold BI.