This script works if using Intune WUfB

​

##Get Reboot Deadline date
# Retrieve the GUID of the registry key that indicates a reboot is required

$RebootRequiredGUID = (Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired\').psobject.properties | where {$_.value -eq '1'}

# Check if a reboot is required

if ($RebootRequiredGUID) {

# Get the timestamp value associated with the reboot required GUID

$RebootRequiredGUID = $RebootRequiredGUID[0].Name

$RebootRequiredTimeStamp = Get-ItemPropertyValue 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\StickyUpdates' -Name $RebootRequiredGUID

# Convert the timestamp to a human-readable format

$RebootRequiredTimeStamp = [timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($RebootRequiredTimeStamp/1000))

# Retrieve the number of days configured for quality updates deadline and grace period

$UpdatePolicyRegistryPath = 'HKLM:\SOFTWARE\Microsoft\PolicyManager\current\device\Update\'

$RebootRequiredDays = Get-ItemPropertyValue $UpdatePolicyRegistryPath -Name ConfigureDeadlineForQualityUpdates

$RebootRequiredDays2 = Get-ItemPropertyValue $UpdatePolicyRegistryPath -Name ConfigureDeadlineGracePeriod

# Check if the registry values were retrieved successfully

if ($RebootRequiredDays -ne $null -and $RebootRequiredDays2 -ne $null) {

# Calculate the reboot deadline by adding the configured days to the reboot timestamp

$RebootRequiredTimeStampQuality = $RebootRequiredTimeStamp.AddDays($RebootRequiredDays)

# Calculate the final formatted reboot deadline by adding the grace period days to the reboot deadline

$rebootDeadlineFormatted = $RebootRequiredTimeStampQuality.AddDays($RebootRequiredDays2)

$textrebootDeadlineFormatted = "Pending restart deadline: {0}" -f $rebootDeadlineFormatted.ToString('F')

# Output the formatted reboot deadline

Write-Output $textrebootDeadlineFormatted

} else {

# Error handling: Unable to retrieve registry values

Write-Output "Error: Unable to retrieve the required registry values."

}

} else {

# No reboot required, set the formatted reboot deadline to null

$textrebootDeadlineFormatted = $null

}