Classic: How to delete a board under grouphub using board delete v2 API

I am trying to delete a board under a Group Hub using the Board Delete v2 API:

DELETE /api/2.0/boards/{board_id}

However, I am receiving a 403 Permission Denied error, even though I am making the API call using a system user with Administrator permissions.

Response:

{ "status": "error", "message": "Permission Denied", "data": { "type": "error_data", "code": 414, "developer_message": "", "more_info": "" }, "metadata": {} }

Could you please let me know if there are any additional permissions or prerequisites required to delete a board under a Group Hub using this API?