The point is, and here i am not 100% sure about Cisco VPN, but the certificated, used by the Client should be created by the CA of LE on UTM. So basically the CA is only 3 month valid. So all Certificates created by this CA should also be only valid 3 months until expiry. There are couple threads in LE community about this. https://community.letsencrypt.org/t/cisco-ios-ssl-vpn-w-lets-encrypt/26476 https://community.letsencrypt.org/t/lets-encrypt-and-openvpn/37126/7
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