static route with path monitor down not removing BGP route

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Hello,

I am having issues with trying to get failover setup between vendor routers. We have vendor provided routers at our hub site and at one of our branch sites. We would like to have the traffic be routed to the branch vendor router in the event the hub vendor router is offline. I have setup a static route on the hub firewall to the hub vendor router with path monitor. I have setup a static route on the branch firewall to the branch vendor router with no path monitor and the administrative distance higher than BGP. I have the vendor network prefix to redistribute in both the hub and branch in the panorama sdwan devices. The issue I am seeing is when the hub vendor router is offline, path monitor shows it down but the hub firewall route is still being used. The branch firewall is still trying to use the route to the hub firewall and not advertising its static route to the hub.  There must be something I am missing but not where else to look. I have included a generic diagram.