Error : exception calling "executequery" with "0" argument(s): "the remote server returned an error: (403) forbidden."

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PowerShell

SharePoint

Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"

$siteUrl = "https://tenant.sharepoint.com/sites/mysitecollection" $username = "username@tenant.onmicrosoft.com" $password = Read-Host -Prompt "Enter password" -AsSecureString
$ctx = New-Object Microsoft.SharePoint.Client.ClientContext($siteUrl) $credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($username, $password)
$ctx.Credentials = $credentials

$webCreationInformation = New-Object Microsoft.SharePoint.Client.WebCreationInformation $webCreationInformation.Url = "site1" $webCreationInformation.Title = "Site 1" $webCreationInformation.WebTemplate = "STS#0" $newWeb = $ctx.Web.Webs.Add($webCreationInformation)

$ctx.Load($newWeb)
$ctx.ExecuteQuery() Write-Host "Title" $newWeb.Title

am i missing something? i'm global administrator for my o365 tenant & sharepoint admin in sharepoint online. still getting this error : Exception calling "ExecuteQuery" with "0" argument(s): "The remote server returned an error: (403) Forbidden."

What I have tried:

I tried using adding new global administrator user in 0365 and then import him into sharepoint Admin group.