Symptoms

'Exchange UM 2013' APS application task fails:

Task name   
APS application 'Exchange UM 2013', id 217, instance 13129 -> service 'Um_Mailbox', instance 47379: executing configuration script

Last execution output   
Application configuration script reported errors: '
error id "INTERNAL_EXCEPTION", setting id "RunspaceException": Internal exception occurred.
Unified Messaging can't validate or generate a UM PIN for mailbox 'user@lync.domain.tld' : An error occurred while accessing the user's mailbox. Details: An internal server error occurred. The operation failed.
at System.Management.Automation.Interpreter.ThrowInstruction.Run(InterpretedFrame frame)
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)'

Cause

Wrong cached data of the corresponding EWS.

Resolution

  1. Check Exchange UM 2013 application instance, related to the problem subscription - it should have 'Ready' state;

  2. Grab the Originating Server value from the following cmdlet output:

    Get-Mailbox -Identity user@lync.domain.tld | fl *

  3. Perform the following cmdlet on mailbox originating server, taken above:

    Get-Mailbox -Identity user@lync.domain.tld | Enable-UMMailbox -Extensions 1234 UMMailboxPolicy "MP00[OA_subscription_id]"

  4. In case you get the same error message as in the task output, recycle the MSExchangeServiceAppPool application pool on mailbox originating server;

  5. Re-submit the failed task;

Internal content

Link on internal Article