ConvertTo-ImmutableId.ps1

function ConvertTo-ImmutableId {
    [CmdletBinding()]
    param (
        [Parameter(Position = 0, ValuefromPipeline = $true, ValueFromPipelinebyPropertyName = $true)]
        [Guid]$ObjectGUID
    )
    
    try {
        $byteArray = $ObjectGUID.ToByteArray()
        $immutableId = [Convert]::ToBase64String($byteArray)
        Write-Output $immutableId
    }
    
    catch {
        Write-Warning $_.Exception.Message
    }
}