Get Dashboards As Admin Expand Tiles Not Working

[TravisKale]

In PowerShell I am issuing the following to the Power BI API to get dashboards while expanding tiles:

$dashboardsApiUrl = "https://api.powerbi.com/v1.0/myorg/admin/dashboards?$expand=tiles"
#$dashboardsApiUrl = "https://api.powerbi.com/v1.0/myorg/admin/dashboards/{dashboardGuid}/tiles"
$apiDashboardsResult = Invoke-PowerBIRestMethod -Url $dashboardsApiUrl -Method Get 
echo $apiDashboardsResult

 The call is successful, no errors, but the Json result does not contain a Tiles array.  If I use the /tiles REST endpoint, as commented out on 2nd line, I can get tiles.  Would be much more efficient in terms of time to execute if expand worked and I could avoid the roundtrip for each dashboard in the org.  Am I doing something wrong or is the API busted?  I believe I am following the Documentation to the letter.   I don't see a way to get the Tiles collection using 

Get-PowerBIDashboard -Scope Organization

Here is a full test case PowerShell script to show the issue:

Login-PowerBI
$ApiUrl = 'https://api.powerbi.com/v1.0/myorg/admin/dashboards?$expand=tiles'
echo $ApiUrl
$apiResult = Invoke-PowerBIRestMethod -Url $datasourceApiUrl -Method Get 
#datasetId is a property on the tiles object, it should be found if tiles were included
if($apiResult -like '*datasetId*') 
{ echo "Found datasetId" } else {echo "Can't find word datasetId in result"}
#control group, should find isReadOnly as it is part of the Dashboard Object and proving casing doesn't matter in search
if($apiResult -like '*isreadonly*') 
{ echo "Found IsReadOnly" } else {echo "Can't find word IsReadOnly in result"}
$apiObjectResult =   $apiResult | ConvertFrom-Json 
$dashboards = $apiObjectResult.value
ForEach ($d in $dashboards)
{
   ForEach($tile in $d.tiles)
   {
    echo "found a tile"
    echo $tile
   }
}
echo "done" 

 The output window shows the following:

https://api.powerbi.com/v1.0/myorg/admin/dashboards?$expand=tiles
Can't find word datasetId in result
Found IsReadOnly
done

[TravisKale · Accepted solution]

I discovered the "Try It" button on the API documentation page.   After playing with this it gave me more meaningful responses then then the Power BI Invoke-PowerBiResetMethod cmdlet does.   I discovered I needed to add the $top query parameter in order for the $expand parameter to take effect.   When using the cmdlet it apears the behavior is just to throw out the $expand parameter if $top is missing and sweep it all under the rug pretending nothing happened.  Final URL endpoint to get it working....

https://api.powerbi.com/v1.0/myorg/admin/dashboards?$expand=tiles&$top=5000