Why is there a hard coded $AADClientId in GetAuthenticationResult() function?

[sethreidnz]

I am reworking some of this to fit into a deployment model that doesn't need 90% of what is happening in these scripts. I have succeeded I am really confused about what this is doing:

function GetAuthenticationResult()
{
    param
    (
        [Parameter(Mandatory=$true, Position=0)]
        [string]$tenant,
        [Parameter(Mandatory=$true, Position=1)]
        [string]$authUri,
        [Parameter(Mandatory=$true, Position=2)]
        [string]$resourceUri,
        [Parameter(Mandatory=$false, Position=3)]
        [string]$user = $null,
        [Parameter(Mandatory=$false)]
        [string]$prompt = "Auto"
    )
    $AADClientId = "1950a258-227b-4e31-a9cf-717495945fc2"
    [Uri]$AADRedirectUri = "urn:ietf:wg:oauth:2.0:oob"
    $authority = "{0}{1}" -f $authUri, $tenant
    write-verbose ("Authority: '{0}'" -f $authority)
    $authContext = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext" -ArgumentList $authority,$true
    $userId = [Microsoft.IdentityModel.Clients.ActiveDirectory.UserIdentifier]::AnyUser
    if (![string]::IsNullOrEmpty($user))
    {
        $userId = new-object Microsoft.IdentityModel.Clients.ActiveDirectory.UserIdentifier -ArgumentList $user, "OptionalDisplayableId"
    }
    write-Verbose ("{0}, {1}, {2}, {3}" -f $resourceUri, $AADClientId, $AADRedirectUri, $userId.Id)
    $authResult = $authContext.AcquireToken($resourceUri, $AADClientId, $AADRedirectUri, $prompt, $userId)
    return $authResult
}

What is the $AADClientId = "1950a258-227b-4e31-a9cf-717495945fc2 doing exactly and what is that client?

[sethreidnz]

I just figured this out. It is because you are using that AAdClientID to authenticate locally so it doesn't matter what the client ID is since the redirect is back to local.

Sorry for issue!