Note that a MX in concentrator mode can advertise a static route. Check out this post I did describing how. https://community.meraki.com/t5/Security-SD-WAN/Vmx-100-routing/m-p/18526/highlight/true#M4455 As @GreenMan says, the OSPF support only advertises AutoVPN routes. I does not listen to routes. If you really want to go down this path you should open a ticket with support and ask to go on the BGP beta program, and change to using BGP. The BGP support is two-way.
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