1. Yes -- Master and T350se is on the same network.
2&3. I am unable to check the IP as I cannot access the AP UI.
I've attempted to hardwire the laptop directly into the AP (utilizing a PoE injector to power up the AP). I cannot seem to get a connection. The Power LED on the AP continues to flash green.
Separately, I then tried to restart and do a hardwired connection via a laptop plugged into same switch as both internet access AND the new AP. Couldn't find the AP.
I cannot access the support article you reference above.