Get Azure AD Tenant Configuration

Get-AADTenantConfiguration.ps1

Function Get-AADTenantConfiguration
{
       
  [CmdletBinding()]
  [OutputType([string])]
  PARAM (
    [Parameter(ParameterSetName = 'ByTenantId', Position=0,Mandatory=$true)]
    [ValidateScript({
          try 
          {
            [System.Guid]::Parse($_) | Out-Null
            $true
          } 
          catch 
          {
            $false
          }
    })]
    [Alias('tID')]
    [String]$TenantID,

    [Parameter(ParameterSetName = 'ByTenantName', Position=1,Mandatory=$true)][Alias('cred')]
    [ValidateNotNullOrEmpty()]
    [String]
    $TenantName
  )
  
  if ($PScmdlet.ParameterSetName -eq 'ByTenantId')
  {
    $URI = "https://login.windows.net/$TenantId/.well-known/openid-configuration"
  } else {
    $URI = "https://login.windows.net/$TenantName/.well-known/openid-configuration"
  }
  $Response = Invoke-WebRequest -UseBasicParsing -Uri $URI -Method Get
  $json = ConvertFrom-Json -InputObject $Response.Content
  $json
}