Fatal error: Uncaught. Is it the form or the 365 server?

[fabydesign]

Hello I have the following errors in trying to send form to Office 365.
I do not have access to MIcrosoft setting, the IT guy does. Before asking I need to know where the errors are coming from. Either a bad customization of the form/scripts (my bad) or the wrong info or bad setup from him (Office 365).
As follow:
Fatal error: Uncaught PHPMailer\PHPMailer\Exception: SMTP Error: Could not connect to SMTP host. Failed to connect to server in /home/xxxxx/public_html/quform/vendor/phpmailer/phpmailer/src/PHPMailer.php:2405
Stack trace:
#0 /home/xxxxx/public_html/quform/vendor/phpmailer/phpmailer/src/PHPMailer.php(2175): PHPMailer\PHPMailer\PHPMailer->smtpConnect()
#1 /home/xxxxx/public_html/quform/vendor/phpmailer/phpmailer/src/PHPMailer.php(1798): PHPMailer\PHPMailer\PHPMailer->smtpSend()
#2 /home/xxxxx/public_html/quform/vendor/phpmailer/phpmailer/src/PHPMailer.php(1615): PHPMailer\PHPMailer\PHPMailer->postSend()
#3 /home/xxxxx/public_html/quform/process-file-uploads-FR.php(427): PHPMailer\PHPMailer\PHPMailer->send()
#4 /home/xxxxx/public_html/quform/process-file-uploads-FR.php(479): process()
#5 {main}
thrown in /home/xxxxx/public_html/quform/vendor/phpmailer/phpmailer/src/PHPMailer.php on line 2405
Thank you.

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