List of incompatibilities for older devices:
UniFiSwitch (Gen1)
US-24-250W
US-24-500W
US-48-500W
US-48-750W
USG
USG-Pro-4
EdgeSwitch
ES-24-250W
ES-24-500W
ES-48-500W
ES-48-750W
EdgeRouter
ER-8
Others
CKG2-RM
ER-RMKIT