Ubnt Discovery Tool V251 And Java On Windows 10 Updated ((link))

Use the "UBNT Discovery" by a third party (read reviews first) or use https://unifi.ui.com if your devices are cloud-connected.

So your full command: %JAVA_HOME%\java.exe -XX:+UseParallelGC -Djava.net.preferIPv4Stack=true -jar UBNT_Discovery_Tool_v2.5.1.jar ubnt discovery tool v251 and java on windows 10 updated

Use a tool like Wireshark to confirm you are actually receiving broadcast frames from the equipment. Use the "UBNT Discovery" by a third party