tweak input

main.tf

@@ -25,7 +25,7 @@ resource "aws_vpc_ipam_pool" "this" {
   auto_import                       = each.value.auto_import
   aws_service                       = try(lower(each.value.aws_service), null)
   description                       = each.value.description
-  ipam_scope_id                     = try((var.vpc_ipam.pools.public_ip_source != "" ? [aws_vpc_ipam.example.public_default_scope_id] : []), (aws_vpc_ipam_scope.this.id), (each.value.ipam_scope_id))
+  ipam_scope_id                     = try((var.vpc_ipam.pools.public_ip_source != "" ? [aws_vpc_ipam.this[0].public_default_scope_id] : []), (aws_vpc_ipam_scope.this.id), (each.value.ipam_scope_id))
 
   # could also create attribute is_public instead of var.vpc_ipam.pools.public_ip_source != ""
   # try doesn't account for multiple scopes with a sub pool created with different scopeids (but aws_vpc_ipam_scope.this.id) is valid