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TMDSPLCKITV4-CEN not communicating over isolation transformer with G3 standard

According to the G3-PLC Alliance website the G3 plc standard  "can effectively cross MV-LV transformers". Currently I'm trying to verify that behaviour with to TMDSPLCKITV4-CEN platforms and an isolation transformer.

PLC 1 system info:

PLC 2 system info:


Both PLC kits are connected to the same computer using USB and I'm using the Zero Configuration GUI tool and the Intermediate GUI tool (From TI) to test their functionality. They work over a normal powered line, but the moment I isolate the one PLC platform behind an isolation transformer I can only send data to it, but not from it. Did any of you have the same issue and how did you solve it?