Yeah, by default not everything is published there. You can publish them in the ChanBox by going there Edit>ChannelControl, with all your Phong nodes selected.
![hamsterHamster_0-1630083780323.png hamsterHamster_0-1630083780323.png](https://forums.autodesk.com/t5/image/serverpage/image-id/958228iEFBB0F308E54FFAF/image-size/medium?v=v2&px=400)
The list is misleadingly called Non-keyable Hidden; select Reflectivity there and click <<Move, which will move to the Keyable list. You should see that attribute now.
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Maya2019.1 @ Windows10 & GeForce GTX1080Ti
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