$zka->setUser() not working properly

[WalidRH]

hello
Does anyone encountered the following issue while adding a new user to the device ?

Sometimes when I try to add a new user to the device, I got a response OK. But when I check the list of users I don't find the recently added user. And the same issue continue if I retried multiple times. but when I restart the device and resend the same user data, there it's added succefully.
the Code I used for adding a new user.

`public function setUser($device_ip, $port, Request $request)
{
$uid = $request['uid'];
$userid = $request['userid'];
$name = $request['name'];
$role = $request['role'];
$password = $request['password'];
$cardno = $request['cardno'];

    $userValidity = $this->isUserDataValid($uid,$userid,$name,$role,$password,$cardno);

    if($userValidity !== true){
        Log::info($userValidity);
        $error = [
            "error" => $userValidity
        ];
        Log::info($error);
        return response()->json($error, 400);
    }
    
    $zka = ConnectionUtils::connectDevice($device_ip, $port);
    if ($zka === false) {
        return response()->json("connection refused", 408);
    }
    $zka->disableDevice();

    $result = $zka->setUser($uid,$userid,$name,$password,$role,$cardno);
    Log::info($result);
    if ($result === false){
        $error = [
            "error" => "Error occurred while adding user to the device."
        ];
        
        return response()->json($error, 502);
    }
    $result = [
        "response" => "User has been successfully added to the device."
    ];
    $zka->enableDevice();
    $zka->disconnect();
    return response()->json($result, 200);
}



    private function isUserDataValid($uid,$userid,$name,$role,$password,$cardno){
    if ($uid > 65535){
        return "uid too large";
    }

    if (strlen($userid) > 9 || !preg_match('/^\d+$/', $userid)){
        return "User ID should contain a maximum of 9 digits.";
    }

    if (strlen($name) > 24){
        return "user name should have less than 24 characters";
    }

    if (strlen($password) > 8 || !preg_match('/^\d+$/', $password)){
        return "password should contain a maximum of 8 digits.";
    }

    if ( $role !== 0 && $role !== 14 ){
        return "user role should either be 0 (for user role), 14 (for admin role).";
    }

    if ( strlen($cardno) > 10 ){
        return "Cardno should contain a maximum of 10 digits.";
    }
    return true;
}`

The problem is that, I don't know HOW or WHEN should I add a user.
The device I use F18

{
"device_Version": "Ver 6.60 ",
"device_OSVersion": "1",
"device_Platform": "ZMM210_TFT",
"device_fmVersion": "10",
"device_fmEdition": "Ver 6.60 Apr 26 2016",
"device_workCode": "0",
"device_ssr": "1",
"device_pinWidth": "9",
"device_deviceName": "F18/ID",
}

Deos anyone have an explanation for this issue??