I’m trying to setup Guardian to work with Phoenix and Ldap. I seem to be stuck with some configuration . My Guardian config looks roughly like this:

config :guardian, Guardian,
  allowed_algos: ["HS512"],
  verify_module: Guardian.JWT,
  issuer: "Issuer",
  ttl: { 30, :days},
  verify_issuer: true,
  secret_key: <MY KEY>,
  serializer: MyApp.Auth.GuardianSerializer

I have a SessionController where I’m hitting Ldap and then doing something like this:

    case Ldap.authenticate(username, password) do
      :ok -> handle_sign_in(conn, username)
      _   -> handle_error(conn)
    end

    {:ok, user} = lookup_user(username)
    conn
    |> put_flash(:info, "Logged in.")
    |> MyApp.Auth.Guardian.Plug.sign_in(user)
    |> redirect(to: "/")

The Ldap portion is working fine, but I keep getting this error from Guardian:

Request: POST /sign_in
** (exit) an exception was raised:
    ** (RuntimeError) No secret key configured for JWT
        (guardian) lib/guardian/token/jwt.ex:319: Guardian.Token.Jwt.fetch_secret/2
        (guardian) lib/guardian/token/jwt.ex:163: Guardian.Token.Jwt.create_token/3
        (guardian) lib/guardian.ex:754: Guardian.returning_tuple/1
        (guardian) lib/guardian.ex:581: Guardian.encode_and_sign/4
        (guardian) lib/guardian/plug.ex:172: Guardian.Plug.sign_in/5
        (infrared) lib/myapp_web/controllers/session_controller.ex:23: MyAppWeb.SessionController.handle_sign_in/2
        (infrared) lib/myapp_web/controllers/session_controller.ex:1: MyAppWeb.SessionController.action/2
        (infrared) lib/myapp_web/controllers/session_controller.ex:1: MyAppWeb.SessionController.phoenix_controller_pipeline/2
        (infrared) lib/myapp_web/endpoint.ex:1: MyAppWeb.Endpoint.instrument/4
        (phoenix) lib/phoenix/router.ex:278: Phoenix.Router.__call__/1
        (infrared) lib/myapp_web/endpoint.ex:1: MyAppWeb.Endpoint.plug_builder_call/2
        (infrared) lib/plug/debugger.ex:99: MyAppWeb.Endpoint."call (overridable 3)"/2
        (infrared) lib/myapp_web/endpoint.ex:1: MyAppWeb.Endpoint.call/2
        (plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4

I can’t tell if this is a config issue on my side or a bug. Any help would be much appreciated.