Uncheck the *Use the shared database* option and set a connection string to the *Default connection string* for this tenant. I used `Server=(LocalDb)\MSSQLLocalDB;Database=MtDemoApp_Volosoft;Trusted_Connection=True;TrustServerCertificate=true` as the connection string value. The database name is `MtDemoApp_Volosoft`. You can Test the connection string to be sure that it is a valid connection string.