Redistributing access and access-internal routes between routing tables?

I'm trying to use Rib-groups to redistribute some subscriber (access and access-internal) routes from a VRF in which they are placed into the global routing table.

Everything I've read points to using rib-groups which I've done. The problem is that the RIB groups only seem to be working for interface-routes and protocol routes. I cannot get the 'access' or 'access-internal' routes to be picked up by the rib group.

Interface routes is easy as follows:

set routing-options rib-groups CUST1-EXPORT import-rib [ Cust1VRF.inet.0 inet.0 ]

set routing-instances Cust1VRF routing-options interface-routes rib-group inet CUST1-EXPORT

This works fine but there is no options using:

set routing-instances Cust1VRF routing-options access . . . . . .

To apply a rib-group to these routes.

Any help appreciated

Thanks