Digi XCTU 7.0 not recognizing Xbee Pro SX but can recover without issue
Got a hold of a Xbee engineer, turns out the USB/UART cable was providing just under the required current. The module was turning on/off, which is why I was having trouble communicating with it. When I had tested it before, I was using a desktop power supply in a lab (which could provide plenty of current).