problems with server SMTP PHPMailer - phpmailer

Question

I have a problem with phpmailer, I have the correct SMPT server data and also the username and password, but it still marks me an error in the credentials, this is my code
<?php
include ("class.phpmailer.php");
include ("../vendor/phpmailer/phpmailer/PHPMailer.php");
include ("../vendor/phpmailer/phpmailer/src/SMTP");
// Import PHPMailer classes into the global namespace
// These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
require '../vendor/phpmailer/phpmailer/src/Exception.php';
require '../vendor/phpmailer/phpmailer/src/PHPMailer.php';
require '../vendor/phpmailer/phpmailer/src/SMTP.php';
require '../vendor/autoload.php';
$name = trim(stripslashes($_POST['contactName']));
$email = trim(stripslashes($_POST['contactEmail']));
$subject = trim(stripslashes($_POST['contactSubject']));
$contact_message = trim(stripslashes($_POST['contactMessage']));
// Load Composer's autoloader
// Instantiation and passing `true` enables exceptions
$mail = new PHPMailer(true);
try {
//Server settings
$mail->SMTPDebug = 2; // Enable verbose debug output
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = 'smtp.gmail.com'; // Specify main and backup SMTP servers
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'admin#ucarolina.mx'; // SMTP username
$mail->Password = '******'; // SMTP password
$mail->SMTPSecure = 'TSL'; // Enable TLS encryption, `ssl` also accepted
$mail->Port = 587; // TCP port to connect to
//Recipients
$mail->setFrom('luribe#qvoz.com');
$mail->addAddress($email, $name); // Add a recipient
// Content
$mail->isHTML(true); // Set email format to HTML
$mail->Subject = $subject;
$mail->Body = $contact_message;
$mail->AltBody = $contact_message;
$mail->send();
echo "Mensaje enviado";
} catch (Exception $e) {
echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
}
?>
and this is the error that marks me
SMTP Error: Could not authenticate.
Message could not be sent. Mailer Error: SMTP Error: Could not authenticate.

Answer 1

There is a line where SMTPSecure has to be specified. You have that line, but tls has been mistyped as TSL. Let's change that:
Change
$mail->SMTPSecure = 'TSL';
to
$mail->SMTPSecure = 'tls';
Additionally, you should add an if/then surrounding $mail->send(); like so:
if (!$mail->send()) {
echo "Mailer Error: " . $mail->ErrorInfo;
} else {
echo "Message sent!";
}
If the mail is not sent, your if statement will catch that and report the error. See an example of such error handling in PHPMailer example: https://github.com/PHPMailer/PHPMailer/blob/master/examples/gmail.phps