Error in Elixir when interpreting the Ñ

I am currently working locally with Elixir 1.13.4 and Erlang/OTP 24 and in the project image we use Elixir 1.17, we are having problems in Production when interpreting the ñ, the data arrives fine but when we show it Elixir interprets it as “├▒ ”We are already trying to convert to different systems like ISO-8859-1 and Windows-1252 but in both cases it is not possible to decrypt, although elixir handles the system by default UTF-8, we put it explicitly in the headers, we verify that the server response is the same, but even creating a local variable and assigning it “child” in inspection we see it as “ni├▒o”.
We also tried different ways of handling string and even applying String.valid?(text) returns it as true, we also tried to handle it with the equivalent ASCII code but it didn’t work.

I am thinking that it is a version problem, since on the server the version of Elixir is 1.17 and exactly the same problem happens and trying in another version such as 1.16 the Ñ (in uppercase) returns it as N and the ñ (in lowercase ) returns it to me correctly, but we need it to be interpreted in both upper and lower case.

No matter what we try we always get the same answer.

   texto = "niño"
    IO.inspect(texto)
    char = "\u00F1"
    IO.inspect(char)

iex(1)> "ni├▒o"
iex(1)> "├▒"