/_cluster/_settings Payload is not allowed

OpenSearch
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
2.9 AWS managed opensearch instance with ml_commons plugin

Describe the issue:
Response when trying to update cluster settings - Your request /_cluster/_settings Payload is not allowed with a 401 response. Then the page auto-refreshes immediately.

Specifically these requests

PUT _cluster/settings
{
   "persistent":{
      "search.pipeline.common.response.processors.allowed": "retrieval_augmented_generation"
   }
}

PUT /_cluster/settings { "persistent": { "plugins.ml_commons.memory_feature_enabled": true, "plugins.ml_commons.rag_pipeline_feature_enabled": true } }

PUT _cluster/settings
{
   "persistent":{
      "plugins.ml_commons.only_run_on_ml_node": true
   }
}

Configuration:
My dashboard user has the role all_access mapped to it.

Relevant Logs or Screenshots:

2

@clinzy Have you checked with AWS support? This could be blocked in the managed service.
What about setting it as transient?