Variable Token unnable to schedule refresh in Power Bi Service

I've been struggling with this API for a few days, where it needs to be executed in two steps:

1. POST request to generate the Token, which is updated every 1 hour.
2. GET request to fetch the content from the API.

When I run it in the Desktop, I have no problems getting the results. However, when I try to turn it into a Data Flow, I start receiving the following error:

(

It's not possible to save the data flow.

One or more tables reference a dynamic data source)

.

When building it step by step, for the 1st step, the Service allows me to save. But when I execute the second step, that's where my problem lies. Below, I'll insert the codes.

Step 1

let 
            urltk = url_,
            cabecalhotk = [
                #"Accept"= "application/x-www-form-urlencoded", 
                #"Content-Type"="application/x-www-form-urlencoded"
            ],
            corpotk = [
                grant_type = "password",
                client_id = client_id_,
                client_secret = client_secret_,
                username = username_,
                password = password_
            ],
            corpoString = Uri.BuildQueryString(corpotk),
            corpoBinario = Text.ToBinary(corpoString),
            tokenResponse = Json.Document(
                Web.Contents(
                    urltk, 
                    [Headers = cabecalhotk, Content = corpoBinario]
                )
            ),
            Token1 = tokenResponse[access_token]
        in 
            Token1

Step 2

let
  url = url_api,
  tokentexto = Json.FromValue(Token),
  tokenconverte = Json.Document(tokentexto),
  cabecalho = [
            Accept = "application/json",
            Authorization = "Bearer " & Token
    ],
  FilterCriteriaAPI = [
        page = "1",
        pub_date_after = "2023-07-24",
        pub_date_before = "2023-07-24"
    ],
  queryStringAPI = Uri.BuildQueryString(FilterCriteriaAPI),
  urlCompletaAPI = url & "?" & queryStringAPI,
  responseAPI = Json.Document(Web.Contents(urlCompletaAPI, [Headers = cabecalho])),
  resultado = responseAPI[results],
  tabela = Table.FromRecords(resultado)
in 
  tabela

I don't know what else to do, I tried to apply the RelativePath, but for some reason, it cannot be accepted in Header's parameter.

Thanks