ADAL token problem when connecting to PowerBI Service via API from powershell

[Anonymous]

hi, 

I'm trying to connect to powerBI by using API from powershell.

this is the code that I'm using:

$common = $PSScriptRoot + "\common.ps1"
. $common

##set parent directory for this file
#set project setting file
$parentfDir = Split-Path $PSScriptRoot -Parent 
$confDir = getFilePath $parentfDir "\json\automation_tools_seting.json"

#get project settings and package parameter
$conf = loadJsonFile $confDir

$user = $conf.PBI_user
$pass = $conf.PBI_pass | ConvertTo-SecureString -asPlainText -Force

$credential = New-Object System.Management.Automation.PSCredential ($user, $pass)
try {
    Connect-PowerBIServiceAccount -Credential $credential

    Disconnect-PowerBIServiceAccount
}
catch {
   Write-Output "$($_.Exception.Message)"
    
}

but it always has an error :

Connect-PowerBIServiceAccount : Failed to get ADAL token:

wondering if there's any mistake inside my code