I don't know.  This sounds related.  It sounds like it would only work if using iBGP.   https://documentation.meraki.com/MX/Networks_and_Routing/Border_Gateway_Protocol_(BGP)#Route_Advertisement_Behavior   "A VPN concentrator will advertise local networks which are not directly connected and are configured on the site-to-site VPN settings page via iBGP, but not via eBGP to external peers." ... View more