Scheduled Refresh for Web.Content

Dear Community, 

I've been trying to publish a dataset on the https://app.powerbi.com service. 

I'm stuck with the refreshing feature though. There is my workflow : 

I create a query on Desktop, running API calls : 

let      

 url = "https://platform.gaelenlighten.com/api/reports?FormName=Safety%20Incident%20Investigation%20Report&&ReportStatus=All&&&&&&&&&&&IsMandatory=All&&&&&&&&OrderBy=Default&OrderByDesc=Default&ThenBy=Default&ThenByDesc=Default&&&key=apikey",
Options = [Headers=[ #"Authorization" = "Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",#"Tenant" = "xxxxxxxx.gaelenlighten.com"]],

iterations = 1000,
FnGetOnePage =

  (url) as record =>
   let
    Source = Json.Document(Web.Contents(url, Options)),
    data = try Source[Reports] otherwise null,
    next = try Source[Links]{1}[RequestUrl] otherwise null,
    total = try Source[TotalResults] otherwise null,
    res = [Data=data, Next=next, Total=total]
   in
    res,

GeneratedList =
  List.Generate(
   ()=>[i=0, res = FnGetOnePage(url)],
   each [res][Total] > 0 and [res][Data]<>null,
   each [i=[i]+1, res = FnGetOnePage([res][Next])],
   each [res][Data])
in
    GeneratedList

This works fine in PBI Desktop. 
When publishing, the refresh does not work on the app.powerbi.com : Web.Content is not supported. 
From there, I use the workaround explained here : https://blog.crossjoin.co.uk/2016/08/23/web-contents-m-functions-and-dataset-refresh-errors-in-power-bi/

And modify the code to get : 

let
   

 url = "https://platform.gaelenlighten.com/api/reports?FormName=Safety%20Incident%20Investigation%20Report&&ReportStatus=All&&&&&&&&&&&IsMandatory=All&&&&&&&&OrderBy=Default&OrderByDesc=Default&ThenBy=Default&ThenByDesc=Default&&",

Options = [Headers=[ #"Authorization" = "Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",#"Tenant" = "xxxxxxx.gaelenlighten.com"]],

iterations = 1000,
FnGetOnePage =
  (url) as record =>
   let
    Source = Json.Document(Web.Contents("https://platform.gaelenlighten.com/api/reports?FormName=Safety%20Incident%20Investigation%20Report&&ReportStatus=All&&&&&&&&&&&IsMandatory=All&&&&&&&&OrderBy=Default&OrderByDesc=Default&ThenBy=Default&ThenByDesc=Default&&", Options)),

    data = try Source[Reports] otherwise null,
    next = try Source[Links]{1}[RequestUrl] otherwise null,
    total = try Source[TotalResults] otherwise null,
    res = [Data=data, Next=next, Total=total]
   in
    res,

GeneratedList =
  List.Generate(
   ()=>[i=0, res = FnGetOnePage(url)],
   each [res][Total] > 0 and [res][Data]<>null,
   each [i=[i]+1, res = FnGetOnePage([res][Next])],
   each [res][Data])
in
    GeneratedList

The refresh online are not showing error apparently.

Thought, when I access my dataset, i do get :

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

The credential type is anonymous, which is the one I use in desktop. Not working here though, while perfectly working in desktop. 

I've tried different types, but couldn't make this work. 

Any support would be much appreciated !

Thank you,

Nicolas