Virtual 3-way White Series

It might be worth adding something to the documentation in the setup areas to make it clearer that ‘vmt31-sn + vmt31-sn’ switches in a 3-way is NOT the recommended solution and tell them what is. Make it explicit, rather than ‘by absense of info’.
(I had to come to the forum to find this out).
I think that as you open up to the matter+thread world, you’re going to see a whole class of less nerdy people that are ‘simpler’ Apple HomeKit users that aren’t going to want to learn about ‘binding’ and set up automations and ferret through forums to get a 3-way dimmer solution up and running.

Both the manual and the switch comparison Matrix state this.

Manual:

Comparison Matrix:

Hi Bry… there is no way that I would ever have guessed that “Matter binding” had anything to do with two switches not being usable for a 3-way switch.

The manual clearly shows a nice picture of two white switches (not an aux ) in step 2. So you get tricked into thinking … “yup… that’s my setup… this is going to be a breeze”.
But then you get down to the section under “switch configuration “ where there’s a table with 3 types…. And… ummmm… it’s not there!
I could have saved myself at least an hour or more of head scratching , and then an hour on this forum to finally realize … “dude: they shoulda just made it clear in the manual in step 2: order the aux switch!!”

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I agree with this. I’ve been using Home Assistant for years now and still didn’t understand what “Matter Binding” meant. Everywhere else in the manual makes it seem like 3-way works without issue. As you said there’s even diagrams detailing how to set it up, only to figure out once you’ve done the install and reset the switches 100 times that it’s not actually supported. I also feel the manual needs to be updated to be more clear on this. Dumb it down a little for people who are trying to setup things like this for the first time and may not know all the technical ins and outs of Matter Binding and Thread.