Using the instruction from the ATX page, it sates to connect the ATX to GPIO 7 & 8. Those are pins 24 & 26 respectively.
From an Off state, when pressing the momentary switch, the Pi does come on. Using htop, we can also see that /etc/shutdowncheck is running.
When pressing the momentary switch for 4 seconds, the PI does nothing. It never enters the shutdown or poweroff sequence.
When holding the switch for 6 seconds, the PI does a forced shutdown.
Can anyone either see any mistake that I have done or have you experienced and solved this?