Create-SPOModernTeamSites.ps1

# This script creates a set of modern team sites without an associated Group from a CSV file,
# using the New-SPOModernTeamSite.ps1 script.

# The script must be run from the SharePoint Online Management Shell and
# you must connect to your SharePoint tenant admin URL with Connect-SPOService before running it.

param(
    # Path: Path/File name of a CSV file that contains populated Title, Url, Owner and AdditionalOwner columns
    [Parameter(Mandatory = $true)]
    [string]$Path
)

$ErrorActionPreference = "Stop"

# Load CSV file
$sites = Import-Csv -Path $Path
Write-Host -f Green "`n$Path loaded`n"

# Create sites
$sites | ForEach-Object {
    Write-Host -NoNewline "Title: "
    Write-Host -f White $_.Title

    Write-Host -NoNewline "Url: "
    Write-Host -f Yellow $_.Url

    Write-Host -NoNewline "Owner: "
    Write-Host -f Cyan $_.Owner

    Write-Host -NoNewline "AdditionalOwner: "
    Write-Host $_.AdditionalOwner

    Write-Host " - Creating site"
    .\New-SPOModernTeamSite.ps1 -SiteTitle $_.Title -SiteUrl $_.Url -OwnerAccountName $_.Owner

    Write-Host " - Assigning additional owner"
    Set-SPOUser -Site $_.Url -LoginName $_.AdditionalOwner -IsSiteCollectionAdmin $true | Out-Null

    Write-Host
}

New-SPOModernTeamSite.ps1

# This script creates a modern team site without an associated Group.

# The script must be run from the SharePoint Online Management Shell and
# you must connect to your SharePoint tenant admin URL with Connect-SPOService before running it.

param(
    [Parameter(Mandatory = $true)]    
    [string]$SiteTitle,
    [Parameter(Mandatory = $true)]    
    [string]$SiteUrl,
    [Parameter(Mandatory = $true)]    
    [string]$OwnerAccountName
)

# LocaleID 2057 is not supported at site creation time and must be applied at the web level
New-SPOSite -Url $SiteUrl -Owner $OwnerAccountName -LocaleID 1033 -ResourceQuota 0 -Template "STS#3" -TimeZoneId 2 -Title $SiteTitle -StorageQuota 1024