Turns out my Unifi WAP (AC Lite ) crapped out on me .....so I thought. Unifi controller was setup for auto updates. Turns out the last update has errors for this unit.
It created a VLAN 0 which is impossible. So the WAP kept sending error reports like a machine gun. In the process it interfered with zigby and the controller would not link.
After disconnecting the WAP, bingo controller now links and works normally.
My installer had to test with a previous firmware and this solved the problem. He installed the latest update and same issue. Deleted the faulty VLAN and network is ba