LACP isn't supported on the MX. But there are topologies that Meraki recommends with Spanning-Tree: You can find them in their documentation:  https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair#:~:text=USB%20cellular%20dongle.-,Recommended%20Topologies,-There%20are%20two ... View more

i will try on a non workday as I can't have this site down. I think both WANs need to be connected to the VPN registry. WAN 2 is under CGNAT and I think its blocking the UDP hole punch  ... View more