@Senan_Rogers 3rd-party VPN routes are not advertised into the AutoVPN route table and there is no way to do so unfortunately. A common workaround when you need to merge both AutoVPN and 3rd-party VPN route tables is to use two different MX appliances as hubs: 1. DC MX1, that's in your main org and terminates your Meraki AutoVPN domain.
2. DC MX2, which is in a dedicated org you create just for terminating 3rd-party VPN.
Then on DC MX1, simply configure a static route for any of the remote, 3rd-pary VPN destinations with a next hop of the inside IP of MX2. The same can be done in reverse on MX2, with a default route pointing towards your MX1 or your DC core.
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