Lutron Caseta one light switch doesn't appear in HASS

I have about 61 Lutron Caseta devices, and the “Pro” bridge.
All of my Lutron devices show up and are controllable via the IOS app.
All but one of my devices appears in HASS via the lutron_caseta integration.
Why is one of my switches missing?
I’ve restarted the integration, disabled/enabled the integration, and power cycled the Caseta bridge.
Any advice/ideas very welcome!