PowerShell script to process cube on Azure - connection issue - powershell

Question

I am trying to process cube on Azure with Powershell script. Have this kind of code:
# PowerShell code
# Connect to a connection to get TenantId and SubscriptionId
$Connection = Get-AutomationConnection -Name "AzureRunAsConnection"
$TenantId = $Connection.TenantId
$SubscriptionId = $Connection.SubscriptionId
# Get the service principal credentials connected to the automation account.
#$null = $SPCredential = Get-AutomationPSCredential -Name "Samcred"
$connectionName = "AzureRunAsConnection"
try
{
# Get the connection "AzureRunAsConnection "
$servicePrincipalConnection=Get-AutomationConnection -Name $connectionName
"Logging in to Azure..."
Add-AzureRmAccount `
-ServicePrincipal `
-TenantId $servicePrincipalConnection.TenantId `
-ApplicationId $servicePrincipalConnection.ApplicationId `
-CertificateThumbprint $servicePrincipalConnection.CertificateThumbprint
}
catch {
if (!$servicePrincipalConnection)
{
$ErrorMessage = "Connection $connectionName not found."
throw $ErrorMessage
} else{
Write-Error -Message $_.Exception
throw $_.Exception
}
}
# Select the correct subscription
Write-Output "Selecting subscription '$($SubscriptionId)'."
$null = Select-AzureRmSubscription -SubscriptionID $SubscriptionId
# Get variable values
$DatabaseName = Get-AutomationVariable -Name 'DatabaseName'
$AnalysisServerName = Get-AutomationVariable -Name 'AnalysisServerName'
# Show info before processing (for testing/logging purpose only)
Write-Output "Processing $($DatabaseName) on $($AnalysisServerName)"
#Process database
$null = Invoke-ProcessASDatabase -databasename $DatabaseName -server $AnalysisServerName -RefreshType "Full" -Credential $SPCredential
# Show done when finished (for testing/logging purpose only)
Write-Output "Done"
After execution there is connection error:
Invoke-ProcessASDatabase : Authentication failed: User ID and Password are required when user interface is not
available.
At line:46 char:9
+ $null = Invoke-ProcessASDatabase -databasename $DatabaseName -server ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Invoke-ProcessASDatabase], ArgumentException
+ FullyQualifiedErrorId : System.ArgumentException,Microsoft.AnalysisServices.PowerShell.Cmdlets.ProcessASDatabase
Using Microsoft SQL Analysis Server (version 15.0.0.52).
Somehow there is need again to put account and password, which I already done.