Support for Windows 10/11 feature Updates via Patch Manager

I've found that Patch Manager is only able to perform an OS upgrade properly if the feature update is via enablement package. If it's a full OS replacement, I've seen the exact same symptoms you're describing. I've gotten around this by using an elevated powershell and psexec (part of the sysinternals suite) to run the update from the command line. You'll need a text file containing the list of computers to update (one per line); set in line 1 of the below code. You'll also need to extract the contents of the ISO to a network location that the computer can access as set in line 9.

$computers = Get-Content C:\temp\Scripting\computers.txt

foreach($computer in $Computers) {
    $Build = $null
    $Build = Invoke-Command -ComputerName $computer -ScriptBlock {(Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion').CurrentBuild} -ErrorAction SilentlyContinue
    If ($null -eq $Build) {Write-Output "$computer not found"}
    Elseif ($Build -lt '26100') {
        Write-Output "Update $computer from $Build"
        & C:\Sysinternals\PsExec.exe -s -d \\$computer "\\SERVERNAME\SHARENAME\Windows 11\24H2\setup.exe" /auto upgrade /eula Accept /dynamicupdate disable /quiet /showoobe none
    }
}

I've found that Patch Manager is only able to perform an OS upgrade properly if the feature update is via enablement package. If it's a full OS replacement, I've seen the exact same symptoms you're describing. I've gotten around this by using an elevated powershell and psexec (part of the sysinternals suite) to run the update from the command line. You'll need a text file containing the list of computers to update (one per line); set in line 1 of the below code. You'll also need to extract the contents of the ISO to a network location that the computer can access as set in line 9.

$computers = Get-Content C:\temp\Scripting\computers.txt

foreach($computer in $Computers) {
    $Build = $null
    $Build = Invoke-Command -ComputerName $computer -ScriptBlock {(Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion').CurrentBuild} -ErrorAction SilentlyContinue
    If ($null -eq $Build) {Write-Output "$computer not found"}
    Elseif ($Build -lt '26100') {
        Write-Output "Update $computer from $Build"
        & C:\Sysinternals\PsExec.exe -s -d \\$computer "\\SERVERNAME\SHARENAME\Windows 11\24H2\setup.exe" /auto upgrade /eula Accept /dynamicupdate disable /quiet /showoobe none
    }
}