Unable to connect Power BI to SQL server db on the same computer

I works a lot with Power Bi and Sql server, from many months, with the db on a server remote, no problems.

I have created a Sql server db on my computer, where Power BI is installed, and I can connect to SQL Server from SQL Server Management Studio(SSMS), with no problems (with windows authentications).

Using PowerBI I have the following error, fig. 2:

"Microsoft SQL: A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)"

(with connections see fig. 1)

but the server is configured to allow remote connections, see fig. 3

help