Hi,

I am experiencing error " Warning: imap_open(): Couldn't open stream {outlook.office365.com:993/imap/ssl}INBOX" after configuring imap my O365 mailbox and trying to refresh mailbox.

The error also shows "PHP Fatal error: Uncaught ErrorException: Notice: Unknown: Retrying PLAIN authentication after AUTHENTICATE failed. (errflg=1) in Unknown:0"

I learned that Microsoft discontinued IMAP using basic authentication, so I think this could be the reason my new Uvdesk server cannot open the mailbox. So I don't know how to make the function work now.

Can you please help me?
Thank you,