Solved! After a week of port forwarding, band steering, MAC filtering, SmartHome 2.4G setup, ....
On the advice of a very patient Telus Support Tech, I replaced the Boost Wi-Fi 6 Access Point with the Technicolor UI (6 panels) with another that uses the Arkadyan UI (Left Menu Bar). My Philips WiZ smart light connected to the Arkadyan model with absolutely no problem and with no special configuration. YAY!
Details from the Telus Smartphone App:
Technicolor EWH1350TLU (Firmware 20.3.h)
Arkadyan Boost 2.1 (Firmware 2.00.18 build 01)