How to Activate Office

This article contains a step-by-step guide on how to activate Office LTSC 2021 on Windows when there is no option to use the internet.

Steps on how to install Office LTSC 2021 on Windows can be found here: https://plannedlink.io/2024/01/06/how-to-install-office-ltsc-2021/

If you experience problems activating Office 2021 or Office 2019, see This product is already installed on another device.

Activate over the Internet

1. In the Activation Wizard, select I want to activate the software over the Internet, and then select Next. If nothing happens when you select Next, use the Enter key on your keyboard.
2. Follow the prompts to complete the activation process. If activation fails, see Troubleshoot activation errors.

Activate by telephone

If this option is disabled, it’s because you’re using Microsoft 365, which doesn’t support telephone activation.

If you see the message “Telephone activation is no longer supported for your product“, you can ignore this error and call the numbers for your specific country/region listed in this article.

1. In the Activation Wizard, select I want to activate the software by telephone, and then select Next. If nothing happens when you select Next, use the Enter key on your keyboard.
2. Under Step 1 in the Activation Wizard, select your country/region, and then call the Product Activation Center phone number that’s listed under the country/region you selected.
3. When prompted by the Product Activation Center, provide the Installation ID that’s shown in the Activation Wizard under Step 2.
4. The Product Activation Center will provide a Confirmation ID that you enter in the Activation Wizard under Step 3.
5. Select Next and follow the prompts to complete the activation process. If nothing happens when you select Next, use the Enter key on your keyboard. If activation fails, see Troubleshoot activation errors.

Reference: Activate Office using the Activation wizard – Microsoft Support