Has anyone gone through the configuration of an IMAP connector to an Exchange online mailbox in a GCC high tenant? I've cobbled together the app registration information in Entra ID and plugged it into the IMAP integration credentials but the integration errors out.  Latest error being "Unable to authenticate with the specified integration. Error 'AUTHENTICATE failed.' There's no readily available means to pull up any logs for me to dig any deeper than this vague error.

There is a good document in the developer portal for this. 

What we are struggeling with is to understand WHAT username we should use to be able to fetch any email within the service principal which "own" e.g., 150 email accounts. We are only able to add a specific user account, but that limit us to one email address and not all.

If you figure that out. Please reach out to me at tobias.zackrisson@elkjop.no 

Dear Pete,

Have you ever tried with the icadmin account to register and fetch the emails? If it works then you may create another user on your domain with the same privilege to use this integration.

Thanks,

Cenk