Can't authenticate to office365 imap server

Hi,We are trying to configure "input mailbox for tickets", we are using Office365. 

It always works a few minutes, tickets are correctly added but then the authentification fails and the input mailbox closes.

There is a screenshot in attachment, you can see that it worked well like 5 minutes and then "can not connect to mailbox".I didn't change anything.


Here are differents errors I got in logs :

2021-08-17 14:28:50.282 ***** ERROR ***** [V9.3.0] ERROR *****
2021-08-17 14:28:50.282 ***** ERROR ***** [V9.3.0] on file '/var/www/html/projeqtor/model/ImapMailbox.php' at line (86)
2021-08-17 14:28:50.282 ***** ERROR ***** [V9.3.0] cause = imap_open(): Couldn't open stream m

2021-08-17 14:28:50.284 ***** ERROR ***** [V9.3.0] Can't open mailbox m: no such mailbox
2021-08-17 14:29:54.923 ***** ERROR ***** [V9.3.0] on file '/var/www/html/projeqtor/model/ImapMailbox.php' at line (86)
2021-08-17 14:29:54.923 ***** ERROR ***** [V9.3.0] cause = imap_open(): Couldn't open stream {outlook.NotAllowedScript6813ecf085ca3office.com:993/imap/ssl}
2021-08-17 14:29:54.929 ***** ERROR ***** [V9.3.0] Too many login failures


2021-08-17 14:30:25.171 ***** ERROR ***** [V9.3.0] on file '/var/www/html/projeqtor/model/Cron.php' at line (936)
2021-08-17 14:30:25.171 ***** ERROR ***** [V9.3.0] cause = mb_detect_encoding(): Illegal argument
2021-08-17 14:30:25.171 ***** ERROR ***** [V9.3.0] mb_detect_encoding(): Illegal argument in Cron.php at line 936
2021-08-17 14:30:25.171 ***** ERROR ***** [V9.3.0] Error while executing CRON script : fix the source issue and manually restart the CRON Process

Yeah maybe you are right.

How can we reduce this ?

Another issue : it seems like projeqtor changes imap password himself. 
For exemple yersterday at 10:07 PM imap password has been changed but no one was connected (see attachment).
We are using ProjeQtOr v9.3