Issues using Ash.Type.Union

defmodule VMX.Transactions.TransactionData.Type.Call do
  use Ash.Resource, data_layer: :embedded

  attributes do
    attribute :call_uuid, :string
    attribute :plivo_recording_url, :string
    attribute :receiver, :string
    attribute :recording_duration, :string
    attribute :recording_url, :string
    attribute :recording_uuid, :string
    attribute :sender, :string
  end
end