diff --git a/modules/net-lb-app-ext-regional/variables-backend-service.tf b/modules/net-lb-app-ext-regional/variables-backend-service.tf
index 78146d431..3cd2933fd 100644
--- a/modules/net-lb-app-ext-regional/variables-backend-service.tf
+++ b/modules/net-lb-app-ext-regional/variables-backend-service.tf
@@ -125,7 +125,9 @@ variable "backend_service_configs" {
       for backend_service in values(var.backend_service_configs) : contains(
         [
           "NONE", "CLIENT_IP", "CLIENT_IP_NO_DESTINATION",
-          "CLIENT_IP_PORT_PROTO", "CLIENT_IP_PROTO"
+          "CLIENT_IP_PORT_PROTO", "CLIENT_IP_PROTO",
+          "GENERATED_COOKIE", "HEADER_FIELD", "HTTP_COOKIE",
+          "STRONG_COOKIE_AFFINITY"
         ],
         coalesce(backend_service.session_affinity, "NONE")
       )
diff --git a/modules/net-lb-app-ext/variables-backend-service.tf b/modules/net-lb-app-ext/variables-backend-service.tf
index 63d445a9d..19e88cb49 100644
--- a/modules/net-lb-app-ext/variables-backend-service.tf
+++ b/modules/net-lb-app-ext/variables-backend-service.tf
@@ -148,7 +148,9 @@ variable "backend_service_configs" {
       for backend_service in values(var.backend_service_configs) : contains(
         [
           "NONE", "CLIENT_IP", "CLIENT_IP_NO_DESTINATION",
-          "CLIENT_IP_PORT_PROTO", "CLIENT_IP_PROTO"
+          "CLIENT_IP_PORT_PROTO", "CLIENT_IP_PROTO",
+          "GENERATED_COOKIE", "HEADER_FIELD", "HTTP_COOKIE",
+          "STRONG_COOKIE_AFFINITY"
         ],
         coalesce(backend_service.session_affinity, "NONE")
       )