Tuya Thermostat Installation

[RandomGrinch]

Please see post #25 for my wiring diagram.

We know what your wiring diagram looks like.

What we are looking for is...

Post a photo of your existing thermostat wiring

Or to be clear, can we see a photo of the wiring behind and connected to your existing stat?

All you have told us so far about the existing stat and it's wiring is...

My current old thermostat only has 3 wires (2 in use for the live in, live out)

Note the N on the room stat is for stats that have a thermal control to finely control the stat triggering and mine does not use ththat.

So, you have three wires on the stat, two are in use.
From this description, it doesn't sound as if you may even have a Neutral wire.
Hence our question - going on about Tuya stats may be moot, if you need a battery operated stat, because there is no neutral.