Connecting Chamberlain MyQ Home Bridge to HomeKit - "Controls Unavailable for this device"

I have a LiftMaster garage door opener. I can open and close it over WiFi in the MyQ app. I wanted to add it to HomeKit so I could control it with Siri. I bought an plugged in a MyQ Home Bridge. I scanned in the Serial Number and Model Number appropriately and added it to the MyQ and HomeKit.

I can't get it to work in HomeKit, either manually or with Siri. get a "Controls unavailable for this device" message. It still works manually in the MyQ app, but I'd like to be able to open the garage door hands-free using Siri while I am driving or while I am just sitting around the house. Any suggestions?