I see this exact same issue has been raised previously about a year ago... Tapo S200B double tap feature does not stick - Smart Home Community Very disappointing that you have not resolved this yet....

Definitely a bug here - just re-done a smart action and even when the double tap is enabled in the button's device settings, the smart action that uses the double tap as a trigger shows as greyed out...

In the smart button settings when I go into the smart action for turning off the lights it is greyed out stating "invalid triggers" when I click into the smart action it then states "double tap...

Smart actions that I have set up to turn lights off when no motion sensed for 15 mins work successfully sometimes but every other day or so keep failing stating invalid triggers because it thinks...

@Wayne-TP Thanks for the reply, yes I considered trying this before posting but held off as all the foam tape I have at the moment is black and all my frames are white so even if it worked it may not...

Help! Just bought 4 of these as they are advertised as door or window contact sensors. Great I thought I can put them on my conservatory and utility doors and windows. Unfortunately they have arrived...