Flux Plug does not transmit energy to several mechanisms. Energy takes only one, the rest are idle. changing mode on surge doesn't help.
Also, it does not give energy to the wires IC2, although it works directly with the mechanisms..

Is Allow Conversion checked in the Edit Network Page?
And is conversion between the various types allowed in the Config file?

Yes, everything is allowed.

Flux point isn't a part of IC2 energy network, you should connect it to MFSU directly, and then use IC2 cables