#Requires -Version 5.1
<#
    JbTecWiz Support Centre -- generated fix script

    Fault : A Group Policy setting is not applying and gpresult does not explain why
    Fix   : Check the user side of processing
    Source: https://jbtecwiz.com/support/srv-id-gpo-not-applying

    Run as     : Elevated PowerShell on the client
    Expect     : 30 minutes
    Risk       : low
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    A user setting.

    HOW TO UNDO IT
    Permission and link changes are reversible in the Group Policy
    Management console.

    This script walks the fix one step at a time and asks before each
    one. Steps with no command are things you do yourself -- it prints
    those and waits. Run with -DryRun to print without executing.

    --------------------------------------------------------------------
    NO WARRANTY - USE AT YOUR OWN RISK

    This script is provided by JbTecWiz as-is and with no warranty of any
    kind, express or implied. You run it entirely at your own risk.

    JbTecWiz accepts no liability for any loss or damage arising from its
    use, including but not limited to data loss, downtime, or configuration
    changes that turn out to be wrong for your system.

    You are responsible for reading this script before running it, for
    satisfying yourself that it suits the machine in front of you, and for
    having a working backup first. Some steps cannot be undone.
    --------------------------------------------------------------------
#>

[CmdletBinding()]
param(
    # Print every step and command without running anything.
    [switch]$DryRun,
    # Do not ask before each step. Read the script first if you use this.
    [switch]$Unattended
)

$ErrorActionPreference = 'Stop'
$script:Failed = 0

function Write-Rule { param([string]$Text)
    Write-Host ''
    Write-Host ('-' * 70) -ForegroundColor DarkGray
    if ($Text) { Write-Host $Text -ForegroundColor Cyan }
}

function Show-Prose { param([string]$Text, [string]$Colour = "Gray")
    if (-not $Text) { return }
    $words = $Text -split "\s+"; $line = "  "
    foreach ($w in $words) {
        if (($line.Length + $w.Length) -gt 74) { Write-Host $line -ForegroundColor $Colour; $line = "  " }
        $line += "$w "
    }
    if ($line.Trim()) { Write-Host $line -ForegroundColor $Colour }
}

function Invoke-Step {
    param(
        [int]$Number, [string]$Do, [string]$Why,
        [scriptblock]$Command, [switch]$Manual, [string]$Shell = "powershell"
    )
    Write-Rule "  Step $Number of 5"
    Show-Prose $Do "White"
    if ($Why) { Write-Host ""; Show-Prose $Why "DarkGray" }

    if ($Manual) {
        Write-Host ''
        Write-Host '  -> Do this yourself, then press Enter to carry on.' -ForegroundColor Yellow
        if (-not $Unattended -and -not $DryRun) { [void](Read-Host) }
        return
    }

    Write-Host ''
    foreach ($l in ($Command.ToString().Trim() -split "`n")) {
        Write-Host ("    " + $l.Trim()) -ForegroundColor Green
    }
    Write-Host ''

    if ($DryRun) { Write-Host "  (dry run -- not executed)" -ForegroundColor DarkGray; return }
    if (-not $Unattended) {
        $a = Read-Host "  Run this step? [Y]es / [S]kip / [Q]uit"
        if ($a -match "^[Qq]") { Write-Host "  Stopped at your request."; exit 0 }
        if ($a -match "^[Ss]") { Write-Host "  Skipped." -ForegroundColor DarkGray; return }
    }
    try { & $Command }
    catch {
        $script:Failed++
        Write-Host ("  Step $Number failed: " + $_.Exception.Message) -ForegroundColor Red
        Show-Prose "The rest of the fix may depend on this. Read the write-up before carrying on." "Red"
        if (-not $Unattended) {
            $c = Read-Host "  Carry on anyway? [y/N]"
            if ($c -notmatch "^[Yy]") { exit 1 }
        }
    }
}

Write-Rule
Write-Host '  A Group Policy setting is not applying and gpresult does not explain why' -ForegroundColor White
Write-Host '  Check the user side of processing' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: low   Reversible   30 minutes'
Write-Host ''
Show-Prose 'No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.' 'DarkYellow'
Write-Rule

if (-not $Unattended -and -not $DryRun) {
    $go = Read-Host '  Ready? [y/N]'
    if ($go -notmatch "^[Yy]") { Write-Host "  Nothing was changed."; exit 0 }
}

Invoke-Step -Number 1 -Do 'Get the full report as the affected user, not as an administrator.' -Command {
    gpresult /h $env:USERPROFILE\Desktop\gpo.html /f
    Start-Process $env:USERPROFILE\Desktop\gpo.html
}

Invoke-Step -Number 2 -Do 'Look at the Denied GPOs section, which states the reason for each -- Security, WMI Filter, or Not Applied (Empty).' -Why 'This section answers the question directly and is below the fold, so it is routinely missed. "Denied (Security)" means the user is not in the security filtering; "Empty" means the half of the policy being used has nothing configured in it.' -Manual

Invoke-Step -Number 3 -Do 'Check the user object is in an OU the policy is linked to. A user in a different OU from their computer is the most common cause of a user policy not applying.' -Command {
    Get-ADUser jbloggs | Select-Object DistinguishedName
    Get-GPInheritance -Target 'OU=Users,OU=Site,DC=example,DC=local' | Select-Object -ExpandProperty InheritedGpoLinks
}

Invoke-Step -Number 4 -Do 'Check security filtering includes the user, and that Authenticated Users still has read permission -- a common hardening change removes it and silently breaks the policy.' -Why 'After the security update that requires it, a GPO where Authenticated Users has been removed entirely does not apply to anyone, even accounts explicitly listed in the filtering. The computer account needs read access for the policy to be retrieved at all.' -Command {
    Get-GPPermission -Name 'My Policy' -All | Format-Table Trustee,Permission
}

Invoke-Step -Number 5 -Do 'If the setting must apply based on the machine rather than the user, enable loopback processing on that machine''s policy.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'gpresult shows the policy applied and the setting present.' 'White'
Write-Host ''
if (-not $DryRun) {
    gpupdate /force
    gpresult /r /scope:user
}

Write-Rule
if ($script:Failed -gt 0) {
    Write-Host ("  Finished with " + $script:Failed + " failed step(s).") -ForegroundColor Yellow
    Show-Prose 'Read the full write-up at https://jbtecwiz.com/support/srv-id-gpo-not-applying' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Permission and link changes are reversible in the Group Policy Management console.' 'DarkGray'
Write-Rule