Problem with Forge createDatabase

I'm using CI 4.0.3
I get an exception 'unknown database 'ikl70fxb_TestDB' ' when I try to create a database defined in my default configuration.

I can make it work by creating another configuration called 'info' and setting 
'database' => 'information_schema' and then passing it to $forge = \Config\Database::forge('info'); 

This is my database config:

PHP Code:

    public $default = [
        'DSN'      => '',
        'hostname' => 'localhost',
        'username' => 'ikl70fxb_root',
        'password' => '123abc',
        'database' => 'ikl70fxb_TestDB',
        'DBDriver' => 'MySQLi',
        'DBPrefix' => '',
        'pConnect' => false,
        'DBDebug'  => (ENVIRONMENT !== 'production'),
        'cacheOn'  => false,
        'cacheDir' => '',
        'charset'  => 'utf8',
        'DBCollat' => 'utf8_general_ci',
        'swapPre'  => '',
        'encrypt'  => false,
        'compress' => false,
        'strictOn' => false,
        'failover' => [],
        'port'     => 3306,
    ]; 


This is how how I call it:

PHP Code:

        $forge = \Config\Database::forge();
        $forge->createDatabase('ikl70fxb_TestDB',TRUE); 


Any ideas?