Supports: 10.1.1.0/24 OR 10.1.1.0 255.255.255.0 OR just 10.1.1.0
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Go to Network > Virtual Routers in PAN-OS. Check which VR owns your egress interface.
Every static route in FortiGate needs a sequence number. To find yours:
show router static. Look for the last edit <number> and use the next available one.