The manual does not show the FMCI-PG1-POE as being compatible with the FMCI-PG1 series.
Pelco Cameras, Pelco Video Management, Pelco Transmission & Power
When trying to set the FMCI-PG1-POE up with using the FMCI-PG1
These two units are compatible, but not shown in the manual you can go from the FMCI-PG1 to a FMCI-PG1-POE as long as the power is attached it will push out POE to the camera
Make sure you attach power to the FMCI-PG1-POE this gives it the ability to push out POE. This unit is compatible with a FMCI-PG1