Error when trying to use Power BI REST API - Invoke-RestMethod : A positional parameter cannot be found that accepts argument - rest

Question

Lately I've been trying to use Power BI REST API to make the refresh of a certain dataset automatically, by calling a .ps1 program. By following this tutorial, I was able to get this code, which is addapted as you can see below:
$groupID = "me" # the ID of the group that hosts the dataset. Use "me" if this is your My Workspace
$datasetID = "MYDATASETID" # the ID of the dataset that hosts the dataset
$clientId = "MYCLIENTID"
# Calls the Active Directory Authentication Library (ADAL) to authenticate against AAD
function GetAuthToken
{
if(-not (Get-Module AzureRm.Profile)) {
Import-Module AzureRm.Profile
}
$redirectUri = "urn:ietf:wg:oauth:2.0:oob"
$resourceAppIdURI = "https://analysis.windows.net/powerbi/api"
$authority = "https://login.microsoftonline.com/common/oauth2/authorize";
$authContext = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext" -ArgumentList $authority
$authResult = $authContext.AcquireToken($resourceAppIdURI, $clientId, $redirectUri, "Auto")
return $authResult
}
$token = GetAuthToken
$authHeader = #{
'Content-Type'='application/json'
'Authorization'=$token.CreateAuthorizationHeader()
}
$groupsPath = ""
if ($groupID -eq "me") {
$groupsPath = "myorg"
} else {
$groupsPath = "myorg/groups/$groupID"
}
$uri = "https://api.powerbi.com/v1.0/$groupsPath/datasets/$datasetID/refreshes"
Invoke-RestMethod -Uri $uri –Headers $authHeader –Method POST –Verbose
$uri = "https://api.powerbi.com/v1.0/$groupsPath/datasets/$datasetID/refreshes"
Invoke-RestMethod -Uri $uri –Headers $authHeader –Method GET –Verbose
I made sure to collect the parameters (groupID, clientID and datasetID) exactly as specified in the links above. However, when I try to execute this code, I get back the error:
Invoke-RestMethod : A positional parameter cannot be found that accepts argument 'â€Headers System.Collections.Hashtable â€Method'.
At C:\Users\me\Desktop:41 char:1
I can't quite tell what's going on, and I even found some similar cases, but none of the solutions worked for me. So, some help would be deeply appreciated.

Answer 1

It looks like this solution is copy/pasted from somewhere and the dashes are screwed up:
Delete the last 3 dashes in Invoke-RestMethod, which looks like dashes, but are other looks like dash unicode symbols, and replace them with normal "typed by the keyboard" ones.
Hope this helps!