Update:
It seems the document is the problem here.

From https://registry.terraform.io/providers/huaweicloud/huaweicloud/latest/docs/resources/cce_node_pool_scale :

• scale_groups - (Required, List, NonUpdatable) Specifies the IDs of scale groups to scale. default indicates the default group.

However, In https://support.huaweicloud.com/intl/en-us/api-cce/ScaleNodePool.html#section3 :

Parameter: scaleGroups
Mandatory: Yes
Type: Array of strings
Definition: Name of the scaling group in a node pool to be scaled.

It accepts names, not IDs.

Problem:
You can’t scale any group beyond “default” because there’s no way to know or fetch the IDs of extended scale groups—huaweicloud_cce_node_pool data source doesn’t expose them.

Repro:

1. Create a NodePool with extra scale groups.

2. In Terraform:

   resource "huaweicloud_cce_node_pool_scale" "test" {
     cluster_id         = var.cluster_id
     nodepool_id        = var.nodepool_id
     scale_groups       = ["????????"]  # what goes here?
     desired_node_count = 2
   }

Expected Fix:

• Data Source: huaweicloud_cce_node_pool must return all scale groups with id.

Without this, users can’t know what to put in scale_groups.