Cookie Persistence iRule not working

app-service none
    auth none
    auto-lasthop default
    clone-pools none
    cmp-enabled yes
    connection-limit 0
    description Webindex_prod
    destination 10.xx.xx.xx:http
    enabled
    fallback-persistence none
    gtm-score 0
    http-class none
    ip-protocol tcp
    last-hop-pool none
    mask 255.255.255.255
    metadata none
    mirror disabled
    nat64 disabled
    partition Common
    persist {
        cookie {
            default yes
        }
    }
    pool Webindex_prod_pool
    profiles {
        blingnet_http_profile {
            context all
        }
        tcp {
            context all
        }
    }
    rate-class none
    related-rules none
    rules {
        cookie_persist
    }
    snatpool snat_68
    source-port preserve
    traffic-classes none
    translate-address enabled
    translate-port enabled
    vlans none
    vlans-disabled
}