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PMP11612: No Output from isolation transformer

Part Number: PMP11612

I prototyped the PMp11612 on a PCB, but the Isolation transformer (POL-05020) is not producing any output. The Schematic is attached below. Pins 1 and 2 of the transformer are getting around 170V, Pin3 has 0V and Pin4 is PGND. The output on Pin9 of the transformer is 0V when it should be 5V. Any idea what's going wrong?

Transformer Datasheet: