Call GenServer from a remote node

I have the following code running on node “a”:

defmodule Devices.Teste do
  use GenServer

  def start_link() do
    IO.inspect(["a", self()])
    GenServer.start_link(__MODULE__, [], [])
  end

  def a(pid) do
    IO.inspect(["b", self(), pid])
    GenServer.call(pid, :a)
  end

  @impl true
  def init([]) do
    IO.inspect(["c", self()])
    {:ok, []}
  end

  @impl true
  def handle_call(:a, from, state) do
    IO.inspect(["d", :a, self(), from])
    Process.sleep(3000)
    {:reply, :xyz, state}
  end

  @impl true
  def handle_info(x, state) do
    IO.inspect(["e", x, self()])
    {:noreply, state}
  end
end

From a node b, I call

{:ok, pid} = :erpc.call(:"a@192.168.15.83", Devices.Teste, :start_link, [])

then, the messages

["a", #PID<0.225.0>]
["c", #PID<0.226.0>]

are printed and the call returns

{:ok, #PID<20968.226.0>}

After that, I call

:erpc.call(:"a@192.168.15.83", Devices.Teste, :a, [pid])

then, the message

["b", #PID<0.227.0>, #PID<0.226.0>]

is printed, but I get the following error:

** (exit) {:exception, {:noproc, {GenServer, :call, [#PID<20968.226.0>, :a, 5000]}}}
    (kernel 8.5.4) erpc.erl:700: :erpc.call/5
    iex:2: (file)

If I call

GenServer.call(pid, :a)

no messages are printed and I get the following error

** (exit) exited in: GenServer.call(#PID<20968.214.0>, :a, 5000)
    ** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started
    (elixir 1.15.0) lib/gen_server.ex:1074: GenServer.call/3
    iex:2: (file)

What am I missing?
As long as I understand, I should use the “remote” pid that I get from the start_link function.