As you all know, Microsoft disabled Basic Authentication as of this month.
Thus, I've updated my site to 1.17 and installed the OAuth2 plugin (downloaded yesterday from the OSTicket Website).
I tried to configure the adresses to fetch mails as before and each time ended up on a 404 while the redirect URI sent me to the default redirect that I copied in Azure from OSTicket : https://osticket.mydomain/api/auth/oauth2
So Azure validated my login (with the same account I was configuring on OSTicket) but still did not fetch the mails and not changing the state of the fetching setting in the "Remote Mailbox" tab.
Also when I try to configure it to try again now, I get a blank popup with Internal Server Errors:
Here is also my Dashboard information tab :
Thanks for your help