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Activation Problems

How to Activate Volume Licenses with VAMT on Offline Computers

Emma BrownEmma Brown Oct 19, 2026 869 views

Question details

The user needs to activate Microsoft Office volume licenses using the Volume Activation Management Tool (VAMT) for client computers that do not have internet access.

How to Activate Volume Licenses with VAMT on Offline Client Computers
Product
Microsoft Office
Device & OS
not provided
Scenario
Deploying and activating Office volume licenses in an organization where client devices are restricted from accessing the internet due to security policies.
Observed behavior
Client computers cannot connect to the internet to complete direct online activation, requiring an alternative centralized proxy or offline activation method.
Before you start

Ensure you have the Volume Activation Management Tool (VAMT) installed on a host computer with internet access, and verify that you have your Multiple Activation Key (MAK) available from the Microsoft Volume Licensing Service Center.

Solution 1Recommended

Perform a VAMT Proxy Activation

Use an internet-connected VAMT host to acquire Confirmation IDs from Microsoft on behalf of your offline client computers.

Proxy activation is designed specifically for environments where computers are isolated from the internet. The internet-connected VAMT host acts as an intermediary, collecting installation IDs from offline clients, sending them to Microsoft, and then distributing the resulting confirmation IDs back to the clients.

1
Discover Client Computers

Open VAMT on your internet-connected host. Use the 'Discover products' feature to scan your local network and add the offline client computers to your VAMT database.

2
Install the MAK Key

Right-click the selected offline computers in the product list, select 'Install product key', and apply your Multiple Activation Key (MAK) to these devices.

3
Acquire Installation IDs

Select the client computers, right-click, and choose 'Update license status' to retrieve their Installation IDs (IIDs) into the VAMT database.

4
Perform Proxy Activation

Select the computers again, click 'Activate', and choose 'Proxy activate'. VAMT will automatically contact Microsoft's servers to exchange the IIDs for Confirmation IDs (CIDs) and apply them to the offline clients.

Perform a VAMT Proxy Activation
Network Requirements: Although the client computers do not need internet access, the VAMT host computer must be able to reach Microsoft's activation servers to acquire the Confirmation IDs.
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Frequently Asked Questions

What is VAMT proxy activation?

Proxy activation is a feature in the Volume Activation Management Tool (VAMT) that allows an internet-connected host computer to perform volume license activations on behalf of client computers that do not have direct internet access.

Can I use KMS instead of MAK for offline computers?

Key Management Service (KMS) requires client computers to connect to the KMS host on your local network at least once every 180 days. If the clients are completely isolated from all networks, KMS will not work, and MAK proxy or telephone activation is required.

Where can I find my Multiple Activation Key (MAK)?

Your MAK keys and their remaining activation counts are located in the Microsoft Volume Licensing Service Center (VLSC) portal or the Microsoft 365 Admin Center under the Billing > Your products section, depending on your organization's purchase agreement.

Why is VAMT unable to connect to my offline clients?

VAMT requires Windows Management Instrumentation (WMI) to communicate with client computers. Ensure that the WMI firewall exception is enabled on the client devices and that you have the necessary administrative privileges on those machines.