Create mysqli database from php

I'm trying to create a database from php but I can not.

The server I use is a must 8 with plesk

and this is the code with which I am trying:

    <?php
$servername = "localhost";
$username = "DB_Admin";
$password = "$4Fd3rnke";

// Create connection
$conn = mysqli_connect($servername, $username, $password);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

// Create database
$sql = "CREATE DATABASE myDB";
if (mysqli_query($conn, $sql)) {
    echo "Base de datos creada correctamente";
} else {
    echo "Error creando la base de datos: " . mysqli_error($conn);
}

mysqli_close($conn);
?>

The error you are giving me is this:

Error creando la base de datos: Access denied for user 'DB_Admin'@'localhost' to database 'myDB'

I do not know if I have the fault in the user or it could be something else. The user created it with privileges to create databases.

What can I have wrong?

The user in plesk has it this way:

In the last attempt to give privileges to the user I have put this:

$sql = "CREATE DATABASE myDB GRANT ALL PRIVILEGES ON myDB.* To 'DB_Admin'@'localhost' WITH GRANT OPTION; FLUSH PRIVILEGES;";

But at the moment I get syntax error.