Demarc Fiber Optic Extension Gone Wrong: I Need Help!

Long story short. NOC gets 0.01 success rate when pings Adva 114 device. . ISP hand off copper then converted to Multimode fiber then to copper again:

• 114 Adva connected to ;

• Cat 8 connected to;

• Media Converter copper to Multimode Fiber connected to;

• Multimode patch cable connected to ;

•Acoupler connected to;

• Armored Multimode mode fiber cable all the way to the Telecom room from the 13th in the basement about 500ft.

Then I crossed over the cable to the same brand media converter and copper cable. So the extension is Copper to Multimode fiber to copper.

I am not sure what's the issue. I am getting -17 dBm and 18uW from one converter and I am not sure about the other tho. Any thoughts about this? Thanks,