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Hello. yes I can help you
I read back through your post from April. It might be a problem with the neutral being on a separate circuit than your 3rd switch. Did you ever find a meter and do a voltage test between the hot at the 3rd switch and the neutral bundle?
Also, was there something plugged into the receptacle when you wired the TP-Link switch and turned on the circuit breaker?
Did you receive my replies earlier? How's it going?
Ok. If that does end up being the problem we can switch the switched part of the outlet to be on the same circuit as the lights/fan controlled by the other 2 switches in the switch box. You would just need a short length of black and white wire about 6" long each
You could try hooking the switch up in place of one of the others in that box to get a quicker answer.