Fiber Media Converter works between router and switch, but not NID and router? HELP PLZ

Usually I'm pretty good at finding answers on the internet to problems I can't solve myself, but there seems to be a distinct lack of documentation floating around regarding this type of setup. If anyone has any knowledge about these devices, or about fiber in general (as I have little experience with fiber media outside of basic troubleshooting and connectivity), please chime in.

Current setup:

---Short version: NID > router > switch, with 2 FMCs between the router and switch due to distance

• internet from provider (Verizon) > NID: via fiber
• NID > router: via CAT6
• router > fiber media converter 1: via CAT6
• fiber media converter 1 (Building 1) > fiber media converter 2 (Building 2): via fiber
• fiber media converter 2 > switch: via CAT6

Hardware list:

• NID: Canoga Perkins 9145E-104
• Router: Cisco 2911
• Fiber media converter 1: TrendNet TFC-1000MSC
• Fiber media converter 2: D-Link DMC-700SC
• Switch: Netgear GS748Tv5

Reasoning:

• We have 2 buildings physically connected to each other. Only Building 1 has a demarc in its telecom room.
• We have 2 internet connections from Verizon that come into Building 1's telecom room via fiber.
• Each building uses one of these internet connections. In this setup, we are only discussing the internet connection for Building 2.
• Building 2's telecom room is a quarter mile away from Building 1's telecom room, thus the need for the fiber media converters and fiber line between them.
• The NID, router, and fiber media converter 1 are all in Building 1's telecom room.
• Fiber media converter 2 and the switch are in Building 2's telecom room.

Task: move the router from Building 1 to Building 2.

Problem: the fiber media converters will not pass through the signal from the NID to the router. They will only pass through the signal from the router to the switch. I have absolutely no idea why.

Explanation and notes: we have a backup internet connection (Comcast) installed in Building 2's telecom room that needs to connect to the router. The easiest solution is to move the router from Building 1 to Building 2, but even though the FMCs work fine to extend the connection from the router to the switch, I get no link light or activity whatsoever when connecting the NID to the router instead.

Images:

• NID: https://imgur.com/v4SKV8m
• Router: https://imgur.com/5fsuqMX
• FMC1: https://imgur.com/DkrbZFk, https://imgur.com/yM3p0Za
• FMC2: https://imgur.com/RtatAY9, https://imgur.com/ETykon9

Does anyone have any clue where to start? Do I need different FMCs that are able to pass through communication from the NID to the router? The existing ones are pretty much plug'n'play. I'd be happy to answer any questions that might help get me towards a resolution that doesn't involve spending countless dollars having our backup internet connection re-run. It also makes more sense to just have the router in the building it serves.

Thanks in advance.