I have an issue during the creation of a VPN with a non-Meraki device: the counterpart's network (192.168.7.0) overlaps with my local network, and they cannot perform NAT on their Fortigate.
Is there something I can do to resolve this situation on my Meraki, considering my local network is directly connected to my MX?
Re-IP your local network to avoid the subnet clash...
or ask them politely again to review if they can do a NAT on the tunnel on their FortiGate as they should be able to, having personally done so in the past on those firewalls.