[Alan Anderson]

I assume you're using a 2014 (or earlier) Power Distribution Board and a 12v-to-5v converter for the D-Link power. Do you have 5 volts going to the D-Link? Do you have a good 12 volts going to the converter?

You might start troubleshooting by disconnecting the converter from the dedicated 12V radio power port and connecting it instead to one of the regular red/black Wago terminal pairs (with a 20A breaker or smaller installed) and see if that gets communication working. If it does, your PDB might have a broken 12V radio supply "boost" circuit.