After providing the service accounts access to mailboxes, you must verify the permissions by using Application Check Readiness.
Note
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This is applicable only for Exchange Online service accounts.
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Exchange Online service account must have Exchange administrator permissions.
It validates the following information:
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Service account email address and password
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Azure application permissions
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PowerShell connectivity
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Service account impersonation permissions
Procedure
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From the CommCell Browser, go to Client Computers > right-click the Exchange client > All Tasks > Check Readiness.
The Client Connectivity dialog box appears.
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Select the Application Check check box, click the Check Readiness option and then click Show Details.