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Hosted Exchange UM Not Being Enabled on Mailbox

Versions Affected​

V15.18.0.756 and earlier

Symptoms​

Unified Messaging (UM) is not enabled on the mailbox.

You may encounter an error indicating that the mailbox policy cannot be found, or that the MailboxPolicy parameter is missing. Regardless of the specific message, the result is that UM is not successfully enabled.

This issue is caused by a bug in the SetUMMailbox.ps1 script used by Exchange Web Services, where the MailboxPolicy value is not properly passed, preventing the mailbox from being enabled for Unified Messaging.

Solution​

The issue is fixed in V15.x versions higher than v15.18.0.756 But for V12.13 the SetUMMailbox.ps1 script should be updated to replace the {UMMailboxPolicy} placeholder so that it reads {MailboxPolicy} as in the below code snippet:

$Identity = '{Identity}';
$UMMailboxPolicy = '{MailboxPolicy}'
$AccessMail = ${AccessMail}