My old master water valve device was Z--wave and no longer works with the Eisy (it did work with ISY) supposedly due to a change in Z-wave protocol. They had me upgrade to a Matter over wifi control but I cannot figure out how to add a Matter device through the admin console. Any help would be appreciated.

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You cannot add a Matter device through admin console. It's done through UD mobile. Make sure Matter support is enabled in Configuration (in admin console). Then in UD Mobile, tap on the gear at the bottom, and select Matter. Follow the prompts. If adding the device fails, you can try adding it to another platform first (like google home or Alexa) and then sharing it to the eisy.

What brand and model was your Zwave valve?