WMI Buffer Cache Hit Ratio not being added

WMI Buffer Cache Hit Ratio not being added

Hello,
 
I am trying to add a new WMI Performance counter to our SQL Server in Opmanager.
 
There is no counter added after selecting Add WMI Monitor -> SQLServer:Buffer Manager -> then putting a check/tick in Buffer Cache Hit Ratio -> then clicking on OK
 
My WMI/SNMP credentials are all setup well, and all pass the 'test'.
 
Any ideas as to why this is not working?
 
Thanks and regards
Troy

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