I have a phase 3 design using ospf with dual hubs over ipsec. Area 0 is going across the DMVPN and I was wanting to inject routes from other areas at my remote sites. Is there unique configuration to execute this being it is coming in from an internal network into a DMVPN?
To my best knowledge, no specific configuration is necessary for this. The OSPF does not really care about running over DMVPN. What you certainly did is configuring your multipoiint GRE tunnel as point-to-multipoint network type and that is all what's required for OSPF over DMVPN Phase3. I suppose you now want to configure your spoke routers as ABRs so that you can create separate areas behind the spoeks and do the usual filtering/summarizing stuff.