Do OFX node Matte inputs work?

I am trying to pipe a matte into and OF node and not having any luck. Anyone have some tips? Or is it just that OFX nodes are still not fully implemented in 15.1.1
Cheers.
Cheers.
https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=80833