Optical Fiber Media Converter issue

I have used 2 Optical Fiber Media Converters (OFMC) to improve connectivity between a device that's at 1 extreme of my building and a switch on the other side of the building. Device is patched via UTP cable to MDF where I connect UTP from
patch block to 1000Base-Tx port on my OFMC, from which fiber cable goes into fiber patch block to transfer signal to IDF. At IDF, connect fiber from patch block to OFMC and from it I connect UTP cable to switch.
My issue is that doing this resulted in unsuccessful link between the switch and device. The only way I got it to work was by adding a small Gigabit switch between the UTP patch block and the OFMC at the MDF, and another small Gigabit switch between the
OFMC and the switch at the IDF.
Can anyone shed any light?
I thank you for your help in advance.

Hi,
Please contact your vendor or change the Fibre cable else you might want to check what kind of Fibre cables you are using.
LC channel
or SC channel ?
Guowen Su
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