Problems using Invoke-PowerBIRestMethod to update parameters

Hello community,

I’m working with multiple workspaces, reports and using powershell script that takes simple CSV file to determine what .pbix file goes into which workspace and what parameters to update (if any).

The script is really simple. It verifies if report name (full path has been received as a command line parameter) exists in the publisher.csv file. If exists then extract all values from a corresponding row (workspace name, dataset refresh request, parameter1 and parameter2 name, parameter1 value and parameter2 value) from the publisher.csv file (based on this blog).

To test the script, I'm using hardcoded $body and $url variables with Invoke-PowerBIRestMethod REST POST call:

#Group ID and Dataset ID 
$urlbase = "groups/4bc15b4f-5dc8-49e3-aaba-XXXXXXXXXXXX/datasets/AAAAAAAA-YYYY-4cb8-898a-222261a5e0d0/"

$body = '{
	updateDetails: [
    {
      "name": "%Date",
      "newValue": "11111111"
    },
    {
      "name": "%Customer",
      "newValue": "Amazon"
    }
   ]
}'

#url and body for UpdateParameters in API call
$url = $urlbase + "UpdateParameters"

Invoke-PowerBIRestMethod -Url $url -Method Post -Body $body -ContentType application/json

However I receive following error: 

Invoke-PowerBIRestMethod : One or more errors occurred.
At C:\Users\UserName\FolderPath\Publish one report.ps1:52 char:5
+     Invoke-PowerBIRestMethod -Url $url -Method Post -Body $body -Cont ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (Microsoft.Power...werBIRestMethod:InvokePowerBIRestMethod) [Invoke-PowerBIRestMethod], Aggregat 
   eException
    + FullyQualifiedErrorId : One or more errors occurred.,Microsoft.PowerBI.Commands.Profile.InvokePowerBIRestMethod
 

Has anyone faced similar issues with this workflow? 

Many thanks in advance!