Help with Gravitiy Digital Self Powered Wireless Switch/Receiver - Pairing not working

Hi folks, 

I have the 433Mhz Self Powered Switch and Receiver (I also have the transmitter you can wire up, but am currently just trying to get the self powered switches to work) 

I have two switches and one Receiver. I have followed the pairing instructions on the wiki, both wiping a few times and pairing and I cannot seem to get the switches to pair from what I can tell.

https://wiki.dfrobot.com/Gravity_Digital_Wireless_Switch_SKU_TEL0140_TEL0142#Pairing 

If I hold the button to clear the light stays blue then flashes twice for success. Then I press the button quickly for a second and it enters ‘pairing mode’ I then click the switch a few times only like 20 cm away and after 6 seconds the blue light just goes off, it does not ‘flash 3 times’ indicating success. This is the exact same for both buttons.

I have it hooked up to a picow and 5v, the red light is on on the receiver but on presses my pico cannot detect any activity on the pin (and the receiver doesn't flash or anything, not sure if it should flash on each press)

Am I doing something wrong? I have tried with antennas coiled a little, straight, a bit further away… nothing. My dip switches are set to off-off-off-on on the switches, not sure if that matters… its just the way they came. 

There is a small red light flash on the switches with each button press, so I can assume they are working.

Anyone got any ideas to help me debug this?

Many thanks, 

Mark