Just a small blog post to share with you, how to set up a S2S VPN between Meraki MX or Meraki Z device & Forcepoint NGFW, I worked on this topic, and there is some things to know :).
Forcepoint VPN Profile

The most important setting is the IKE. I tested using the IKEv1, in main mode or agressive, and it’s not working.
Meraki Configuration

It’s important to choose IKEv2, to select the correct network for the Phase2 (create the tags and assign the tags to the correct network).
And everything should work :)