"error":"InvalidRegistration" while sending notification from PHP

Trying the mentioned code with registeration_ids and to parameter and both are not working. Help me to solve the same. Every time it is giving this error of multi cast id and InvalidRegistration. Getting this error: {"multicast_id":8367359766XXXXXXXXX,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"InvalidRegistration"}]}

function send_notification () {
    $fcmUrl = 'https://fcm.googleapis.com/fcm/send';
    $args = func_get_args();
    $response = ["status" => 0, "message" => "Notification couldn't be sent"];

    $title = "Hey test notification";
    $body = "";
    $apiKey = "QWERTYHHVCFVBVBN";//Server key under the Project settings
    $tokenArr = ["XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX","YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY"];
    $refId = 123;
    $msgNotification = [
        "title" => $title,
        "body" => $body
    ];
    $extraNotificationData = [
        "refId" => $refId,
        "title" => $title
    ];

    $fcmNotification = [
        "registration_ids" => $tokenArr,
        "notification" => $msgNotification,
        "data" => $extraNotificationData
    ];
    $headers = [
        "Authorization: key=" . $apiKey,
        "Content-Type: application/json"
    ];
    
    $encodedData = json_encode($fcmNotification);
    // echo "<pre>";print_r($fcmNotification);exit;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$fcmUrl);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $encodedData);
    $result = curl_exec($ch);
    if ($result === FALSE) {
        die("Curl failed: " . curl_error($ch));
    }
    print_r($result);exit;
    curl_close($ch);
    $response = ["status" => 1, "message" => "Notification sent to users", "payload" => $result];

    return $response;
}