Fix: Microsoft Account Does Not Recognize a Device Serial Number
Question details
The user is attempting to add a second device to their Microsoft account using a serial number, but the system fails to recognize it.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Adding a new PC or Mac to a Microsoft account to install a Microsoft 365 subscription.
- Observed behavior
- The system rejects the device registration and displays the error message, 'We didn't recognize this serial number.'
Ensure you have the login credentials for the specific Microsoft account that owns the active Microsoft 365 subscription, and that you are physically operating the new device where you want to install the software.
Install Microsoft 365 Directly from the Services Dashboard
Bypass the device serial number registration by downloading and installing Microsoft 365 directly from your account's services page.
Microsoft 365 installations are linked to your user account, not your physical device's serial number. You do not need to register a computer's serial number to your account just to install Office applications.
Turn on the new PC or Mac where you want to install the software and launch your preferred web browser.
Navigate to https://account.microsoft.com/services/ and sign in using the exact Microsoft account associated with your active Microsoft 365 subscription.
Once logged in, scroll through your dashboard to find your active Microsoft 365 Personal or Family subscription.
Click the 'Install' button next to your subscription details. Follow the on-screen prompts to download the installer and run it to complete the Office setup on your new device.
Avoid Installation Hassles with WPS Office
Tired of dealing with account recognition errors, device limits, and subscription management? Switch to WPS Office. It provides a lightweight, free alternative to Microsoft Office that does not restrict you with complicated device registrations.
- 1. Download the software: Visit the official WPS Office website and click the free download button for your operating system.
- 2. Run the installer: Open the downloaded installation file and follow the simple on-screen instructions.
- 3. Start creating instantly: Launch WPS Office and open your existing documents immediately without worrying about device serial numbers.
Frequently Asked Questions
Why does Microsoft ask for a serial number if it is not needed for Microsoft 365?
Microsoft accounts allow you to register hardware devices, such as Surface tablets or Xbox consoles, to manage warranties and support. This hardware registration uses serial numbers but is a completely separate process from installing Microsoft 365 software.
How many devices can I install Microsoft 365 on?
With a standard Microsoft 365 Personal or Family subscription, you can install the software on all of your devices. However, you can only be actively signed in to Office on up to five devices simultaneously.
Can I transfer my Microsoft 365 installation to another computer?
Yes. You do not need to transfer physical licenses. Simply sign in to your Microsoft account on the new computer and download the software. If you hit your active device limit, you can sign out of an older device remotely via your Microsoft account dashboard.
