perf_counter Items Not Supported

[snmpguru8]

Zabbix 4.0

Zabbix cannot detect the Perfmon counters for the SMTP Server role, all items are "Not Supported"

- I have a Server 2016 Core instance with the SMTP Server role installed.
- "typeperf" commands for SMTP Server counters work fine
- "zabbix_get" from the Zabbix server fails
- Agent debug log shows "The specified object is not found on the system."
- Firewall is off
- From a remote Windows system, I can query the SMTP Server perfmon counters
- Zabbix can query other perfmon counters fine, such as Processor metrics, for instance
- I have tried to reset and rebuild the perflib database
- I have tried to use the SMTP Server counter IDs instead of names to no avail

I found this old thread from 2011 which stated (https://www.zabbix.com/forum/zabbix-...-not-supported):
"Ok. I found the issue, system was a 64bit machine. Apparently some counters do not work for zabbix when you install a 32bit version unto a 64bit machine.

Thanks for all the help."

I don't know if this is useful, but this issue has me pulling my hair out.