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The system will take two minutes to begin polling the emails from the mail client server if the communication channel is set to "Enabled" and "Authenticated.”

Some of the common errors that you can get during communication channel registration

Error Code

Error Description

Solution

Authorization code should not be empty or null for generating the access token

Try to re-authenticate the communication channel by updating the auth-info (you can find this by clicking the (blue star) (three dot button) → update auth info. )

MS-AADSTS53003

AADSTS53003: Access has been blocked by Conditional Access policies. The access policy does not allow token issuance.

Check the Conditional Access policy of your organization (https://portal.azure.com/#view/Microsoft_AAD_ConditionalAccess/ConditionalAccessBlade/~/Policies), it might be that your organization have put some restriction on MS applications like location or device or sign in restrictions, due to which our service (outside of your organization) not able to connect/authenticate.

References

https://learn.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth

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