I have not been able to get inbound emails to work for any of the modules using MS Exchange IMAP/oAuth.

I have my Office tenant setup for app access (and can successfully connect and perform actions using other systems). In the Live HelpDesk module, I have configured everything under Administration-Channels-Email as per the documentation. When I click Test Connection, I get the green 'Successfully Connected ' response.

In spite of green lights in the Email Channel config, emails are never picked up from the configured mailbox. I can see Live HelpDesk logging tasks in the scheduler with a repeating error message:   - 

Process channel email failed. !See event log for details

In the admin logs, I see the following General Exceptions getting logged:

Message:The ImapClient is not authenticated.
StackTrace:
   at MailKit.Net.Imap.ImapClient.CheckAuthenticated() at MailKit.Net.Imap.ImapClient.get_Inbox() at Mandeeps.DNN.Modules.LiveHelpdesk.Components.Scheduler.ProcessChannelEmail()
 

And also...

Message:Authentication failed.
StackTrace:
   at MailKit.Net.Imap.ImapClient.<AuthenticateAsync>d__100.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MailKit.Net.Imap.ImapClient.Authenticate(SaslMechanism mechanism, CancellationToken cancellationToken) at Mandeeps.DNN.Libraries.Common.Manager.MailKitManager.ConnectIMAP(String serverName, String user, String password, Nullable`1 port, Boolean EnableSsl, String AccessToken, Exception& exception)

I am trialing these modules and really like them. I would love to move forward with a purchase, but inbound email processing is very important to us and I'd like to make sure it works before moving forward.

How can I troubleshoot this further and get oAuth working to pickup emails via IMAP or POP?