Hyperelasticity with contact, 2D axisymmetric not supported?

Hi all,

I'm trying to run some analysis of a piston seal arrangement to understand better how it might be working.  Having had some initial results, I now wonder whether I should be using a hyperelastic material for the elastomer.

I've created such a material from some data from the web which seemed roughly appropriate, but I've realised that in my analysis definition, Hyperelasticity has been automatically selected (so far, so good) but Contacts is greyed out and deselected.

Is contact not supported for hyperelasticity in 2D axisymmetric?  Obviously I'm running 2D axisymmetric because the problem suits it, and it's massively faster than trying to solve this in 3D...