How to add a new pc to Microsoft 365 Personal

Aalen Wall 165 Reputation points
2025-11-08T20:26:23.7433333+00:00

I have Microsoft 365 Personal and want to add a new computer. I go to Devices/Register Devices. The Select Device list is odd. It lists X Box etc, but not PC/Laptop. Does that come under Other Devices?

Also I enter the serial number of the new Laptop and the system doesn't recognise it (after using Other Devices header). Why not? Is there a prior step which the system unhelpfully assumes I know about, so doesn't tell me.

Any help would be appreciated.

Microsoft 365 and Office | Install, redeem, activate | For home | Windows

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Xavier-D 13,995 Reputation points Microsoft External Staff Moderator
2025-11-09T02:30:44.08+00:00

Hello Aalen Wall,

Thank you for posting your questions on Microsoft Q&A forum

To answer your questions:

It is not possible to register a device on your Microsoft account using a serial number, that process only works for Microsoft manufactured devices such as Surface, Xbox, controllers, etc.

Non‑Microsoft PCs are linked automatically when you sign in to Windows with your Microsoft account and enable sync features. There’s no manual serial‑number registration for these devices.

Ensure you log into Windows with your Microsoft account:

In the settings app and go to the location settings, ensure you have Location services enabled for all apps and also the 'Find my Device' setting, then that device will be automatically added to your account online.

Feel free to reply back to this post if you have any more questions or require assistance, I'll be happy to help.

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  1. Ahmed Salah 6 Reputation points
    2025-11-08T20:36:15.8333333+00:00
    1. Sign in on the New PC
      • On your new computer, go to Microsoft 365 or open any Office app (Word, Excel, etc.).
      • Click Sign in and use the same Microsoft account associated with your Microsoft 365 Personal subscription.
    2. Install Office Apps
      • After signing in, click Install apps from the Office homepage.
      • Download and run the installer to install Word, Excel, PowerPoint, etc.
    3. Activate Office
      • Once installed, open any Office app.
      • Sign in again with your Microsoft account if prompted.
      • Your subscription will automatically activate on this PC.

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