Approval (send from Outlook) produce Mail lstener error

Hi,

I have approval proces and it works fine if approval is done from portal ut if it is done from Outlook then following error is logged:

Requestor: urn:uuid:5fc8629d-bd10-483d-a17b-ed0b842e4d84
Correlation Identifier: f3050e15-eec3-4483-967c-d2b5d7b3bee2
Microsoft.ResourceManagement.WebServices.Exceptions.UnwillingToPerformException: Other ---> System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.ThrowHelper.ThrowKeyNotFoundException()
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Microsoft.ResourceManagement.Query.QueryParametersGenerator.WriteRequestedAttributes()
   at Microsoft.ResourceManagement.Query.QueryParametersGenerator.BuildParameterString()
   at Microsoft.ResourceManagement.Query.QueryProcessor.BuildSqlCommand(Query objectRepresentation, Boolean countResultsOnly)
   at Microsoft.ResourceManagement.Query.QueryProcessor.ExecuteQuery(Query query, Nullable`1 maximumTime, Boolean& endOfSequence, Boolean countResultsOnly, Int64& resultCount, Int64& executionTime)
   at Microsoft.ResourceManagement.WebServices.RequestDispatcher.ExecutePullActionImpl(PullRequestParameter pullParameter)
   at Microsoft.ResourceManagement.WebServices.RequestDispatcher.ExecuteEnumerateAction(RequestType request)
   at Microsoft.ResourceManagement.WebServices.RequestDispatcher.ExecuteAction(RequestType request)
   at Microsoft.ResourceManagement.WebServices.RequestDispatcher.ExecuteAction[ResponseBodyType](RequestType request)
   at Microsoft.ResourceManagement.WebServices.RequestDispatcher.DispatchRequest[ResponseBodyType](RequestType request, Guid requestIdentifier, Object redispatchSingleInstanceKey, Boolean isRedispatch)
   at Microsoft.ResourceManagement.WebServices.RequestDispatcher.DispatchRequest[ResponseBodyType](RequestType request)
   at Microsoft.ResourceManagement.WebServices.ResourceManagementService.Enumerate(Message request)
   --- End of inner exception stack trace ---

And "Mail listener error: Cannot process message" message is send in result to approver.

One more thing - I have such behaviour for one account (repeatable) bot for other account it is working correcly.

What should I check?

Borys Majewski, Identity Management Solutions Architect (Blog: IDArchitect.NET)