Huzzah Feather & Annex Basic

Hi, I’m using my Huzzah - Feather that uses a 4Meg Tenx ESP8266 chip and wish to use the [excellent] Annex Basic software with it…
I successfully flash the module using NodeMCU and can access the module’s webpage and Examples, Demos etc - all that works But I can’t see an output using a CRO on any GPIO pins. eg 16, 2 etc.
However if I run a I2C scanner program I see pulses on the SCK & SDA pins.
The program on this link “turns on the led on the webpage” but pin 16 is dead.
I tried changing the prog to pin 2 but still no activity.
Any thoughts?