Event ID 26319 on RMS Every 2 minute

Hi,

Recently we are getting this Error 26319 in our RMS and seems this is causing performance issues in SCOM

Below is the log from Event viewer.

An exception was thrown while processing GetTasksByCriteria for session id uuid:9c08d0b6-1869-4f08-8be9-fa297ffd319c;id=45.

Exception Message: The creator of this fault did not specify a Reason.

Full Exception: System.ServiceModel.FaultException`1[Microsoft.EnterpriseManagement.Common.UnauthorizedAccessMonitoringException]: The creator of this fault did not specify a Reason. (Fault Detail is equal to Microsoft.EnterpriseManagement.Common.UnauthorizedAccessMonitoringException: The user CORP\TXTX does not have sufficient permission to perform the operation.).

Am new to scom and am unable to find why this ID, "corp\TXTX  is generating this error in our RMS.

as well is there a way to find out how many user accounts are associated with agent and MP's?

Thank you.