@Riley_S Thank for you the reply. I litterally just came inside to post an update. It turns out that it was not the switch or the wiring, but the actual light bulb. Yesterday, it never dawned on me...

After completing the installation of an HS200 light switch, and using the Kasa app, the device was discovered, and connected to my Wi-Fi with no issue. I am able to turn on the light, with either the...