HTCC_AB02A Running from Battery

I have an HTCC-AB02A running as a lorawan node quite happily from its USB connector as a power supply, If I fit a 3.6V ER14250 Battery and remove the USB supply it no longer Keeps working.
Looking at the circuit it states its an automatic swapover - What am I missing here!

Do you have a multimeter or other tool to measure voltage? You can test if there is power on the “VDD” pin.

I had the same problem as you. However, I accidentally pressed the RST button with battery inserted and it now works.

Posting here to help anyone with the same problem.