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Shared Mailbox IMAP with Oauth doesn't work for members part of mail-enabled groups

We followed https://docs.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth to access a shared mailbox using IMAP protocol. We have a user account and a shared mailbox which belongs to same mail-enabled security group.

  • Scenario 1(Works): Add the group as member of shared mailbox with full access. The user account is able to access the shared mailbox using IMAP with Basic Authentication.

  • Scenario 2:(Doesn't work) Add the group as member of shared mailbox with full access. The user account is NOT able to access the shared mailbox using IMAP with Oauth Access Token.

  • Scenario 3(Works): Add the user account directly as a member of shared mailbox. The user is able to access the mailbox using IMAP with both Basic and Oauth.


Why isn't scenario 2 not working given that the user account has access to the mailbox via the group?

office-exchange-server-mailflowoffice-exchange-server-dev
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Hi, @TejoKumar-3838

Since your question is related to Exchange Server Development, I have added the tag "office-exchange-server-dev" to it, which is used for Exchange Server Development.
Thanks for your understanding and hope you get the answer soon.

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Any update here?

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