How to add_tag? Managing Relationships

defmodule App.Shop.Product do
  [...]
  relationships do
    many_to_many :tags, App.Shop.Tag do
      through App.Shop.ProductTag
      source_attribute_on_join_resource :product_id
      destination_attribute_on_join_resource :tag_id
    end
  end

  actions do
    defaults [:read]

    create :create do
      primary? true
      argument :tags, {:array, :map}

      argument :add_tag, :map do
        allow_nil? false
      end

      change manage_relationship(:tags, type: :append_and_remove, on_no_match: :create)
      change manage_relationship(:add_tag, :tags, type: :create)
    end

    update :update do
      primary? true
      argument :tags, {:array, :map}

      argument :add_tag, :map do
        allow_nil? false
      end

      change manage_relationship(:tags, type: :append_and_remove, on_no_match: :create)
      change manage_relationship(:add_tag, :tags, type: :create)
    end
  end

  code_interface do
    define_for App.Shop
    define :create
    define :read
    define :update
  end
end

iex(1)> App.Shop.Product.create!(%{name: "Banana"}, add_tag: %{name: "Yellow"})
** (Ash.Error.Unknown) Unknown Error

* %NimbleOptions.ValidationError{message: "unknown options [:add_tag], valid options are: [:upsert?, :upsert_identity, :upsert_fields, :internal?, :timeout, :tracer, :verbose?, :action, :authorize?, :stacktraces?, :tenant, :actor, :after_action, :return_notifications?, :notification_metadata]", key: [:add_tag], value: nil, keys_path: []}
    (ash 2.14.18) lib/ash/api/api.ex:2179: Ash.Api.unwrap_or_raise!/3