Resolve Alert subscription ID to name

Hello everybody,

I'm expierencing some trouble with alert notification. On a regular base I get an alert about the fact that alert notification takes too long. I copied this from the eventviewer:

Log Name:      Operations Manager
Source:        Health Service Modules
Date:          6-10-2014 11:22:57
Event ID:      11411
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      xxxx
Description:
Alert subscription data source module encountered alert subscriptions that were waiting for a long time to receive an acknowledgement.
 Alert subscription ruleid, Alert subscription query low watermark, Alert subscription query high watermark:
5fcdbf15-4f5b-29db-ffdc-f2088a0f33b7,10/06/2014 09:07:09, 10/06/2014 09:10:09


Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Health Service Modules" /><EventID Qualifiers="32768">11411</EventID><Level>3</Level><Task>0</Task><Keywords>0x80000000000000</Keywords><TimeCreated SystemTime="2014-10-06T09:22:57.000000000Z" /><EventRecordID>8281981</EventRecordID><Channel>Operations Manager</Channel><Computer>xxxx</Computer><Security /></System><EventData><Data>5fcdbf15-4f5b-29db-ffdc-f2088a0f33b7,10/06/2014 09:07:09, 10/06/2014 09:10:09</Data></EventData></Event>

If I'm understanding it correctly this ID "5fcdbf15-4f5b-29db-ffdc-f2088a0f33b7" is representing one of my subscriptions. So i tried to resolve it with Powershell, but this is what I get:

PS C:\Users\Slinkos> Get-SCOMNotificationSubscription -id 5fcdbf15-4f5b-29db-ffdc-f2088a0f33b7 | ft DisplayName
Get-SCOMNotificationSubscription : An object of class NotificationSubscription with ID 5fcdbf15-4f5b-29db-ffdc-f2088a0f
33b7 was not found.
At line:1 char:1
+ Get-SCOMNotificationSubscription -id 5fcdbf15-4f5b-29db-ffdc-f2088a0f33b7 | ft D ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (Microsoft.Syste...scriptionCmdlet:GetSCNotificationSubscriptionCmdlet
   ) [Get-SCOMNotificationSubscription], ObjectNotFoundException
    + FullyQualifiedErrorId : ExecutionError,Microsoft.SystemCenter.OperationsManagerV10.Commands.GetSCNotificationSub
   scriptionCmdlet

So what am I doing wrong? I don't know how else I should troubleshoot this.