Run below script to enable inheritance for Bulk AD user under specific OU (enable inheritance on all AD user accounts)
$ADusers = Get-ADUser -ldapfilter "(objectclass=user)" -searchbase "OU=Students,DC=ukh,DC=edu,DC=krd"
ForEach($user in $ADusers)
{
# Binding the users to DS
$ou = [ADSI]("LDAP://" + $user)
$sec = $ou.psbase.objectSecurity
if ($sec.get_AreAccessRulesProtected())
{
$isProtected = $false ## allows inheritance
$preserveInheritance = $true ## preserver inhreited rules
$sec.SetAccessRuleProtection($isProtected, $preserveInheritance)
$ou.psbase.commitchanges()
Write-Host "$user is now inherting permissions";
}
else
{
Write-Host "$User Inheritable Permission already set"
}
}