In FTB Beyond version 1.10 flux plugs will transmit power from TE Energy Cubes and EnderIO capacitors but won't from the cables. I also tried sending with xnet cables and would not transmit. It seams there is no problem receiving power with flux points connected to energy cables.

Fixed in dev - (1.12.2)

I've also experienced this issue with thermal expansion's fluxducts and enderio energy conduits

Wondering if there is a fix