If you have a red, black, green, and white wire attached to your original switch than you have a 3-way switch meaning 2 switches control one light.  This switch is supposed to be for lights with one switch.  There is a way to bypass the 2nd switch if you really want to use the smart switch there, but you would need to take the 2nd switch out and change the wiring a little.

Hoss16 wrote

Need a little help with my new TP 200 switch.

 

Out of the wall box I have a white(neutral), copper (ground), a red and a black.

 

On the switch, I attach the white to white, green to the copper, and the black switch wires to the red and the other to the black coming from the box.

 

I get power and wifi to the switch and connection to my phone.  My issue is that the light flicks on and then off immediately both when I manually turn it on or when I use the phone.

 

Any suggestions as to why? Is my wiring wrong?

Thanks for the reply.

That is odd as it only controls 1 light.

When I took the regular switch out.  The white was not being used, the red was in the top right amd the black was in the bottom right.

Is the 3 wire (Red, Black, White, Ground) the only wire in switch box?

yes

I watched that video.  Still no dice.  I know for fact it only controls one light

I’m having the same problem and mine is also a one way (not a two way). Did you ever get it figured out? Can you lend advice?

I haven't tried lately.  If I get it figured out I will post