Build-In User Role missing from Operations Manager 2012

Something strange happened recently where we tried to install OM 2012 Reporting, but that failed with the follwing error message logged into the installation log file: Warn: :Message:SRSPolicySetter SoapException Exception: System.Web.Services.Protocols.SoapException: The user or group name ‘{2537B367-6D74-4110-B0B5-1F51C1B1B09E}’ is not recognized. —> Microsoft.ReportingServices.Diagnostics.Utilities.UnknownUserNameException: The user or group name ‘{2537B367-6D74-4110-B0B5-1F51C1B1B09E}’ is not recognized.    at Microsoft.ReportingServices.WebServer.ReportingService2005Impl.SetSystemPolicies(Policy[] Policies)    at…

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