Firebase FCM error: "results":[{"error":"InvalidRegistration"}]}"

Question

"{"multicast_id":2590279481594016535, "success":0, "failure":1, "canonical_ids":0, "results":[{"error":"InvalidRegistration"}]}"

this Error i am getting, below is the code.

$deviceToken = Str::random(60);

// Store the device token in the user's record
$user->forceFill([
    'device_token' => $deviceToken,
])->save();

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Authorization: key=SERVER_KEY',
    'Content-Type: application/json'
));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$data = array(
    "to" => $token,
    "notification" => array(
        "title" => 'Login successful',
        "body" => 'You have successfully logged in.',
        "sound" => 'default'
    )
);

curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));

$result = curl_exec($ch);

if ($result === FALSE) {
    die('Curl failed: ' . curl_error($ch));
}

curl_close($ch);

This is the correct way to pass the token.