Hey @Grosbiz – happy to help here.
Just to confirm, the Primary Switch (ie: the one that sends the Associations to the Secondary) should not be connected to the load. The Secondary Switch should be connected to the Load. If you have it reversed, it won’t work as the switch connected to the load would be sending associations to the switch that is not connected to anything.
Also, I just wanted to confirm that both switches are paired with the same security (ie: S2 vs S0). To find out how your switch paired, you can check IDE (instructions can be found here: https://support.inovelli.com/portal/en/kb/articles/how-to-find-your-device-info-for-troubleshooting-smartthings#Finding_Your_Device_Information) under the Data section.
Hang in there, we’ll get you up and running!