Configure the list of blocked TPM commands
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Windows Vista
Path in the GPO console
Computer Configuration\Administrative Templates\System\Trusted Platform Module Services Description
This policy setting allows you to manage the Group Policy list of Trusted Platform Module (TPM) commands blocked by Windows. If you enable this policy setting, Windows will block the specified commands from being sent to the TPM on the computer. TPM commands are referenced by a command number. For example, command number 129 is TPM_OwnerReadInternalPub, and command number 170 is TPM_FieldUpgrade. To find the command number associated with each TPM command with TPM 1.2, run "tpm.msc" and navigate to the "Command Management" section. If you disable or do not configure this policy setting, only those TPM commands specified through the default or local lists may be blocked by Windows. The default list of blocked TPM commands is pre-configured by Windows. You can view the default list by running "tpm.msc", navigating to the "Command Management" section, and making visible the "On Default Block List" column. The local list of blocked TPM commands is configured outside of Group Policy by running "tpm.msc" or through scripting against the Win32_Tpm interface. See related policy settings to enforce or ignore the default and local lists of blocked TPM commands.
Registry
SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands Value name: Enabled
Enabled: Enabled = 1
Disabled: Enabled = 0
MDM / Intune (CSP)
./Device/Vendor/MSFT/Policy/Config/ADMX_TPM/BlockedCommandsList_Name Microsoft Learn documentation Mapping data: Microsoft Learn (CC BY 4.0)
Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Configure the list of blocked TPM commands
; State: Enabled
; Supported on: At least Windows Vista
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands]
"Enabled"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands\List]
; List values: enter one value per line in the builder UI.More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Configure the list of blocked TPM commands
# State: Enabled
# Supported on: At least Windows Vista
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Enabled' -Value 1 -Type DWord
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands\List'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.Intune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/ADMX_TPM/BlockedCommandsList_Name
Data type: String
Value:
<enabled/>
<!-- BlockedCommandsList_Ordinals2: enter one value per line before copying this XML payload. -->Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Configure the list of blocked TPM commands
# State: Enabled
# Supported on: At least Windows Vista
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
# HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands\List: List values: enter one value per line in the builder UI.
$checks = @(
(Test-RegistryValue -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands' -Name 'Enabled' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Configure the list of blocked TPM commands
# State: Enabled
# Supported on: At least Windows Vista
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Enabled' -Value 1 -Type DWord
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands\List'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.SCCM scripts
# Exported from gporais.com
# Policy: Configure the list of blocked TPM commands
# State: Enabled
# Supported on: At least Windows Vista
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Configure the list of blocked TPM commands
# State: Enabled
# Supported on: At least Windows Vista
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
# HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands\List: List values: enter one value per line in the builder UI.
$checks = @(
(Test-RegistryValue -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands' -Name 'Enabled' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Configure the list of blocked TPM commands
# State: Enabled
# Supported on: At least Windows Vista
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Enabled' -Value 1 -Type DWord
$path = 'HKLM:\SOFTWARE\Policies\Microsoft\Tpm\BlockedCommands\List'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.Building a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.