Connecting to Application Insights: Bad Gateway Error from Power BI

Hi,

I have a problem connecting Power BI to application insights. I will often get (502): Bad Gateway when running the query, and if I adjust the time period downwards in the query, it will then work.

I created the query in https://analytics.applicationinsights.io and chose the Export Power BI Query (M) option, then pasted that into Power BI Desktop.

The query is as follows:

let AnalyticsQuery =
let Source = Json.Document(Web.Contents("https://management.azure.com/subscriptions/0cd37710-98b7-4c41-ac4d-19a7f1f6cc0c/resourcegroups/JiwaFinancials/providers/microsoft.insights/components/jiwa7/api/query?api-version=2014-12-01-preview", 
[Query=[#"csl"="pageViews | project ['timestamp'] = (timestamp + 10h + 0min), ['Form Name'] = name, ['Jiwa Version'] = customDimensions.[""Jiwa Version""],['Jiwa Username'] = customDimensions.[""Jiwa Username""],['Company Name'] = customDimensions.[""Company Name""],['Database Name'] = customDimensions.[""Database Name""],['SQL Product Version'] = customDimensions.[""SQL Product Version""],['SQL Product Edition'] = customDimensions.[""SQL Product Edition""],['SQL Product Level'] = customDimensions.[""SQL Product Level""],['Operating System'] = client_OS,['Country'] = client_CountryOrRegion,['State'] = client_StateOrProvince,['City'] = client_City",#"x-ms-app"="AAPBI", #"timespan"="P6D"],Timeout=#duration(0,0,16,0)])),
TypeMap = #table(
        { "DataType", "Type" }, 
        { 
            { "Double",   Double.Type },
            { "Int64",    Int64.Type },
            { "Int32",    Int32.Type },
            { "Int16",    Int16.Type },
            { "UInt64",   Number.Type },
            { "UInt32",   Number.Type },
            { "UInt16",   Number.Type },
            { "Byte",     Byte.Type },
            { "Single",   Single.Type },
            { "Decimal",  Decimal.Type },
            { "TimeSpan", Duration.Type },
            { "DateTime", DateTimeZone.Type },
            { "String",   Text.Type },
            { "Boolean",  Logical.Type },
            { "SByte",    Logical.Type }
        }),
DataTable = Source[Tables]{0},
Columns = Table.FromRecords(DataTable[Columns]),
ColumnsWithType = Table.Join(Columns, {"DataType"}, TypeMap , {"DataType"}),
Rows = Table.FromRows(DataTable[Rows], Columns[ColumnName]),
Table = Table.TransformColumnTypes(Rows, Table.ToList(ColumnsWithType, (c) => {c{0}, c{3}}))
in
Table
in
    AnalyticsQuery

The part that determines the timespan : #"timespan"="P6D" seems to be related to the problem.  If I change the timespan to P7D It fails with (502): Bad Gateway.

I thought maybe the timeout value was too small - but it's at 16 minutes and even when I increase the value the 502 error comes back within 2 to 3 seconds.

I tested retrieving the data from application insights using https://dev.applicationinsights.io/apiexplorer and I was able to retrieve 90 days worth of data without issue.

Why is Power BI giving me a Bad Gateway error when trying to retrieve more than 6 days of data?