Power BI Online return Credential Invalid Error on Anonymous Access of API URL

[ThalesFerraz]

I can refresh the dataset normally by Power BI Desktop.
Using this (example):

Spoiler

let
    url = #"@LINK_WS"
        & "LOGIN=" & #"@LOGIN"  
        & "&SENHA=" & #"@SENHA"
        & "&NOME=WS_SC_LOTE_ATIV"
        & "&DATA_INICIO=2015-01-01"
        & "&DATA_TERMINO=2016-12-01",

    Source = Xml.Tables(Web.Contents(url)),
    
    Table0 = Source {0}[Table],
    #"Tipo Alterado" = Table.TransformColumnTypes(Table0,{{"COD_LOTE", Int64.Type}, {"COD_ITEM", Int64.Type}, {"QUANTIDADE", type number}, {"VALOR_UNITARIO", type number}})
in
    #"Tipo Alterado"

But I can't refresh the dataset in Power BI Online because it is returning the error below:

Spoiler

Your data source can't be refreshed because the credentials are invalid. Please update your credentials and try again.Hide details

Activity ID:	be69162c-e02e-9249-c9b0-64b362864e72
Request ID:	0a540359-b538-586b-4441-9c2442d04d13
Status code:	200
Time:	Wed Jul 27 2016 11:32:09 GMT-0300 (Hora oficial do Brasil)
Version:	13.0.1500.472

More information:

• When click on "edit credentials" Power BI Online returns a dialog box. If I keep the "Anonymous" option and click "Sign In" works normally and the error disappears, but when trying to use the "Refresh Now" keeps returning the same error.
• The API URL don't works with credentials.
• The API URL return a XML table.
• The API URL only works on my server (computer).
• My Personal Gateway is working ON.

Edited 28/07/2016 15:39

Hello there,

The above error "with the credentials" happens before refresh.
After refresh the Power BI Online returns the error below:

Spoiler

Refresh history

ScheduledOneDrive

Details Type Start End Status Failure message

Show	On demand	28/07/2016 14:16:43	28/07/2016 14:48:25	Failed	There was an error when processing the data in the dataset.
Hide	On demand	28/07/2016 13:44:20	28/07/2016 14:16:43	Failed	There was an error when processing the data in the dataset.
Data source type:   Data source error: O tempo limite da operação foi atingido Cluster URI: WABI-BRAZIL-SOUTH-redirect.analysis.windows.net Activity ID: 24439e2e-de13-4c2e-a0ab-d12809ddbb30 Request ID: 3a72c3dd-2cb6-399a-918f-54a2af9d5303 Time: 2016-07-28 17:16:43Z