@EricM_Inovelli It seems to me there’s a significant data point that has been brought up in this thread that needs highlighting because that may lead to a solution at your end. A number of people in a 3-way configuration have reported that things started working after they set parameter 21 (AC Power Type) to Neutral. Neutral is the default. We should not have to set it to Neutral, yet here we are. My own experience also confirms it. At first I switched parameter 22 to 3-way Toggle and left parameter 21 alone because the default was right. (I’m referring to the parameters number for the LZW31-SN.) Then I went to parameter 21 and explicitly set it to Neutral through Home Assistant. Note that Home Assistant was already reporting that it was Neutral, but I ignored that and asked HA to set it. It sent the ZWave command, and after that this problem was gone. (I ran into another one… but that’s another story.) Then I came here and found some people essentially describing that they did what I did: even though Neutral is the default, they set the parameter to Neutral.
For me this looks like a bug in the firmware of the LZW31-SN, where it reports values that are the defaults expected, but in fact it is operating with values that are not the default. Maybe these are the values used in testing? There’s a note in the installation instructions mentioning that it is possible during the testing process that a switch won’t be excluded from the testing network and may get to the customer still included in the testing network. Maybe there’s sometimes a similar problem with testing parameters? The switch still operates with parameters used in testing, though it reports the expected defaults?