We had an issue in one of our clients site where some SCCM Administrator were receiving SCCM 1810 Client Notification error in the console. They informed us that they just upgraded to SCCM 1810 recently.
When we tried to initiated a client notification on SCCM 1810, the following error occured :

ConfigMgr Error Object:
instance of SMS_ExtendedStatus
{
Description = "CSspClientOperation: no permission to initiate the operation.";
ErrorCode = 1112017920;
File = "..\\sspclientoperation.cpp";
Line = 1177;
Operation = "ExecMethod";
ParameterInfo = "SMS_ClientOperation";
ProviderName = "WinMgmt";
StatusCode = 2147749889;
};

Clearly a missing permission in the security role of the affected users… but which one ? We found our answer in the SCCM 1810 What’s new documentation :

A new permission is now required to perform the Client Notification Actions.
Here’s how to fix this error :


That’s it, your user will be able to do again their client notification actions.
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