Wiring – How to wire 2 gang smart switch with two neutral wires and wire connecting both COMM

While the Philippines have some unusual power configurations, none of that has any bearing here. OP has the modified Euro style hookup, where ground is centered halfway between the live conductors, 120V from either conductor. Pick either supply wire to act as "neutral" here, just be consistent.

This is a switch loop. What makes it special is it's a 3-wire switch loop because it controls two appliances, just as OP says. But it still has all the normal properties of a switch loop.

Including the absence of a neutral and thus, inability to power powered switches such as smart switches.

OP's options are:

• if it's conduit, just fish another wire to be the opposite leg.
• Replace the cable to the switch with /4 cable, which has 4 wires and ground. /3 will not do, do not use a ground wire for a neutral especially not in the Philippines.
• Make both appliances switch together, freeing up the needed wire.
• Find smart devices able to power themselves old-school by leaking small amounts of power through the load.
• Find a smart device able to live up in the ceiling rose, and be remotely controlled in some way.
• Give up the project.

Ok, so what you had before were 2 completely separate 3-way switches.
The White wires are not neutrals in either of them, and this is normal!
Depending on which end of the 3-way wiring we're looking at, the Black wires may not even be Hot, and if they are, they may not be on the same breaker or even on the same phase (although if they were on different phases you'd probably know about it by now due to the tripped breakers and/or big flash/bang).

What you had on each switch: Black (common) Red & White (Travelers) - so depending on the switch position, either the Red or the White is connected to the Black.
If you look at the 3-way switches on the other end of each cable you should find the same wiring.

So, remove that nut on the white wires - they're not neutrals and do not belong together. Instead, put a nut on each one individually and forget about them.
Also remove the nut you've put on to join all of the Blacks together - they're not the same circuit.

Go to the 3-way switches at the other ends of those cables, remove the switches, nut the white wires individually and forget about them as you've just done, and nut the Red and Black on each cable to each other (not between cables).
Now go back to your wireless switches and connect each one individually to the Red and Black on each cable.

Done.