enter image description hereI tried to add some data to my Database which is on the server and I get this error

Warning: mysqli::__construct(): (HY000/1130): Host ‘ххх .ххх.ххх ‘ is
not allowed to connect to this MariaDB server in./…/..

The user was created through Cpanel and was granted all permissions.
Example code below:

Warning: mysqli::__construct(): (HY000/1130): Host 'ххх .ххх.ххх' is not allowed to connect to this MariaDB server in

<?php
$servername = "xxx.xxx.xxx";
$username = "theveis1_nand1";
$password = "xxxxxxxxx";
$dbname = "theveis1_userdata";
$conn = new mysqli($servername,$username, $password, $dbname);
    if($conn->connect_error){
        die("Error connect DB".$conn->connect_error); 

    }
?>

<?php
    ini_set('display_errors', 1);
    ini_set('display_startup_errors', 1);
    error_reporting(E_ALL);


 if($_SERVER["REQUEST_METHOD"]== "POST"){
    include  "$_SERVER[DOCUMENT_ROOT]/assets/coments/connectDB.php";

    if ($conn === null) {
        die("Error connect DB");
    }

I’m a beginner, so I can’t understand why this error (
Please help, explain the error and also help to fix it)
THANK YOU VERY MUCH in advance