Help with posting content to azure ml web services

Hello there

So I created a web service experiment that I successfully tested it through calling it via Excel.

Now I would like to call it via Power bI but I dont know how to compose my content.

let
     Score= (sp1 as any, sp2 as any, Religion as any, Marital as any, Gender as any, LiveAlone as any, Age as any, HasNeeds as any) =>

let

//note: these should be private, these serviceuri and servicekey will not be guaranteed to work, use your own and be careful when sharing!

serviceUri="azuremlserviceuri",
serviceKey="mykey"

PostContents= "

{
  ""Results"": {
    ""output1"": {
 //   ""type"": ""DataTable"",
    ""value"": {
    ""ColumnNames"": [
      ""sp1"": """&sp1&""",
      ""sp2"": """&sp2&""",
      ""Religion"": """&Religion&""",
      ""Marital"": """&Marital&""",
      ""Gender"": """&Gender&""",
      ""LiveAlone"": """&LiveAlone&""",
      ""Age"": """&Age&""",
      ""HasNeeds"": """&HasNeeds&"""
    },
    ""GlobalParameters"": {}
  }
}
        
                   
",
      //Define Wait function
    Wait = (seconds as number, action as function) =>
            if (List.Count(
             List.Generate(
              () => DateTimeZone.LocalNow() + #duration(0,0,0,seconds),
              (x) => DateTimeZone.LocalNow() < x,
              (x) => x)
              ) = 0)
               then null else action()
    //Call Wait function to wait 5 seconds
    //then return the current time again
   
,
    Source=Wait ( 0.05, () => Web.Contents(serviceUri,
 [Content=Text.ToBinary(PostContents),
 Headers=[Authorization="Bearer "&serviceKey,#"Content-Type"="application/json; charset=utf-8"]])),
    #"Imported JSON" = Json.Document(Source),
    #"Table from List" = Table.FromList(#"Imported JSON", Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Transposed Table" = Table.Transpose(#"Table from List")
   in
     #"Transposed Table"
    in Score

Then I got an error message "We cannot apply operator & to types Text and Number."

Where did i go wrong? Please could you assist?

Thank you very much in advance.