Get-MicrosoftTenantId

1.1

Get-MicrosoftTenantId.ps1

                                
<#PSScriptInfo

.VERSION 1.1

.GUID 4b250f93-9e99-4018-90c7-7b9a3b8f6e9a

.AUTHOR Kalichuza

.COMPANYNAME

.COPYRIGHT

.TAGS 365

.LICENSEURI

.PROJECTURI

.ICONURI

.EXTERNALMODULEDEPENDENCIES 

.REQUIREDSCRIPTS

.EXTERNALSCRIPTDEPENDENCIES

.RELEASENOTES

.PRIVATEDATA

#>

<# 

.DESCRIPTION 

 Get Microsoft tenant id from public api url 

#> 

[CmdletBinding()]

param (

    [Parameter(Mandatory=$true)]

    [string]

    $TenantDomain

)

try {

    $uri = "https://login.microsoftonline.com/$TenantDomain/v2.0/.well-known/openid-configuration"

    $response = Invoke-RestMethod -Uri $uri -ErrorAction Stop

    $tenantId = $response.issuer.Split('/')[3]

    if (-not $tenantId) {

        throw "Tenant ID could not be parsed from issuer URL."

    }

    return $tenantId

}

catch {

    Write-Error "Failed to retrieve tenant ID for domain '$TenantDomain'. The domain might not be valid or connected to M365."

}