Hi Jim,
Did you get an answer for this? We are also getting this error.
2023/09/07 16:42:32 [ERROR] Could not retrieve System Setting [api.xmlmc.queryExec.maxResultsAllowed]: The following rights [manageSystemSettings] in Group C are needed to invoke the method admin::sysOptionGet
2023/09/07 16:42:32 [ERROR] Error returned from sysOptionGet The following rights [manageSystemSettings] in Group C are needed to invoke the method admin::sysOptionGet
I have noticed that our User Import role does not have the Manage System Settings permissions in configuration - only manage keysafe
The admin role has Manage System Settings under configuration, I think that is what is missing. I'll log a ticket if this is what it is.