The MX should be able to initiate the negotiation of the tunnel.
Do you see any events in the Meraki event log? Specifically using the following filter
![Brash_0-1703126631115.png Brash_0-1703126631115.png](https://community.meraki.com/t5/image/serverpage/image-id/34689i64975EEF8C01F706/image-dimensions/625x125?v=v2)
If you do a packet capture outbound on the MX, do you see packets going out towards the destination?
If you're using FQDN, make sure that the MX can resolve the domain name.