Dear osTicket experts,

The automatic retrieval and deletion of emails from our Microsoft mailbox has been working for us for months, maybe even years, without any problems. However, since Tuesday, retrieval has stopped working, even though we haven't changed anything. The emails are obviously marked as read, as we can see in the mailbox, but they are not being sent to the ticket system as tickets.

In addition, the administrator account receives an email with the subject "Mail Fetcher" and the text:

Excessive errors processing emails for ssl://outlook.office365.com:995/POP [...]
Please manually check the Fetch Folder () [2/30 - 0/2].

I have to disable our cron job for automatic retrieval, because otherwise we receive an error notification every five minutes. Not to mention that the ticket emails pile up in the support mailbox.

I have already done everything I can think of:

I updated osTicket, first to version 1.17.6, then again to 1.18.2.
I took the opportunity to update the OAuth plugin, as recommended here: https://forum.osticket.com/d/105871-new-build-of-oauth2-plugin-released
I also completely removed the plugin and reinstalled it.
I even deleted the app registration in the Azure Portal and Entra ID and completely recreated it according to these instructions: https://docs.osticket.com/en/latest/OAuth2/Microsoft%20Authorization%20Guide.html
I have checked the scopes and set them up according to these instructions: https://docs.osticket.com/en/latest/OAuth2/Microsoft%20Deprecations%202024/Licensed%20Personal%20Emails.html

The strange thing is that token generation seems to be working. The token is always renewed, as I can see in the osTicket system. In addition, some kind of access to the mailbox is apparently taking place - otherwise, the emails in our support mailbox would not be marked as "read" when automatically retrieved by the cron job. But as I said, no tickets are being created.

I am really grateful for any help or advice on how to narrow down the problem.

Best regards,
Florian

Shared web hosting service
osTicket v1.18.2, Apache, MySQL 5.7.44, PHP-Version 8.3.19
Mailbox settings: