diff --git a/main.tf b/main.tf
index 600e26e..4dd5c70 100644
--- a/main.tf
+++ b/main.tf
@@ -1,4 +1,7 @@
 locals {
+  # Store the list of principals and convert to set
+  ram_principals = var.create_tgw && var.share_tgw ? toset(var.ram_principals) : []
+
   # List of maps with key and route values
   vpc_attachments_with_routes = chunklist(flatten([
     for k, v in var.vpc_attachments : setproduct([{ key = k }], v.tgw_routes) if var.create_tgw && can(v.tgw_routes)
@@ -161,9 +164,9 @@ resource "aws_ram_resource_association" "this" {
 }
 
 resource "aws_ram_principal_association" "this" {
-  count = var.create_tgw && var.share_tgw ? length(var.ram_principals) : 0
+  for_each = local.ram_principals
 
-  principal          = var.ram_principals[count.index]
+  principal          = each.value
   resource_share_arn = aws_ram_resource_share.this[0].arn
 }
 
diff --git a/outputs.tf b/outputs.tf
index 8dcb8a5..94223ef 100644
--- a/outputs.tf
+++ b/outputs.tf
@@ -96,5 +96,5 @@ output "ram_resource_share_id" {
 
 output "ram_principal_association_id" {
   description = "The Amazon Resource Name (ARN) of the Resource Share and the principal, separated by a comma"
-  value       = try(aws_ram_principal_association.this[0].id, "")
+  value       = [for k, v in aws_ram_principal_association.this : v.id]
 }