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

Hello,
We are getting there!
I greatly appreciate you formidable help in the process.
I was able to retrieve the refresh token, it is really super long.
I copied it into the php files instead of ‘YOUR_REFRESH_TOKEN’
Now after trying the form, I get the following error:
<b>There was a problem</b>
Fatal error: Uncaught PHPMailer\PHPMailer\Exception: SMTP Error: Could not authenticate. in /home/xxxxx/public_html/quform/vendor/phpmailer/phpmailer/src/PHPMailer.php:2384
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.php(454): PHPMailer\PHPMailer\PHPMailer->send()
#4 /home/xxxxx/public_html/quform/process-file-uploads.php(533): process()
#5 {main}
thrown in /home/xxxxx/public_html/quform/vendor/phpmailer/phpmailer/src/PHPMailer.php on line 2384
Is that still related to authentification?
Thank you