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You can't have static routes for the same remote CIDR to 2 different destinations (VPN gateways) in the same route table. The recommended approach here would be to have both the primary and secondary VPN tunnels use dynamic routing via BGP. You can use BGP settings like local preference and AS PATH prepending to determine the primary tunnel/path. If the primary tunnel goes down, the BGP routes for it will go away making the backup VPN tunnel the active route.
https://docs.aws.amazon.com/vpn/latest/s2svpn/vpn-redundant-connection.html
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