OneDrive Error Codes

How to Fix OneDrive Undefined Storage Purchase Error

Maira Mehtab Sep 22, 2026 869 views

Question details

The user needs to resolve an 'undefined or buy for undefined' error message that appears when trying to purchase additional OneDrive storage after reaching their current limit.

Product: Microsoft OneDrive
Device & OS: not provided
Scenario: Attempting to purchase additional cloud storage after reaching the Microsoft account storage limit.
Observed behavior: The system displays an 'undefined or buy for undefined' error message instead of processing the storage plan upgrade.

Before you start

Ensure you are signed into the correct Microsoft account associated with your current OneDrive subscription and have a stable internet connection.

Solution 1Recommended

Upgrade Storage via OneDrive Web Application

Bypassing the local application and using the web interface often resolves display and connectivity glitches associated with the 'undefined' error.

Sometimes the local OneDrive application struggles to load the newer Microsoft 365 subscription options properly. Accessing your account via a web browser forces the system to fetch the most up-to-date plans.

Access OneDrive online

Open a web browser and navigate to onedrive.live.com.

Sign in to your account

Enter your Microsoft account credentials to log in.

Navigate to Settings

Click on the gear icon located in the top right corner of the screen to open the Settings menu.

Select the Upgrade option

Click on 'Upgrade' to review the available storage plans, such as Microsoft 365 Personal or plans with Copilot.

Complete the purchase

Follow the on-screen prompts to select your preferred plan and complete the payment process.

Solution 2

Verify Billing Information and Subscription Status

Incorrect billing regions or conflicting active subscriptions can trigger undefined purchase errors.

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Frequently Asked Questions

Why does my OneDrive show an 'undefined' error when buying storage?

This error typically occurs due to a synchronization glitch in the local OneDrive app, outdated browser cache, or a conflict between your current Microsoft subscription and the newly available plans (like those including Copilot).

Will I lose my files if I cannot upgrade my OneDrive storage immediately?

No, your existing files will remain safe in OneDrive. However, until you successfully upgrade your storage or free up space, you will not be able to upload new files, sync edits, or send and receive emails if you use Outlook.

Can I fix the undefined purchase error from the OneDrive mobile app?

Mobile applications can sometimes retain outdated cache data, causing purchase errors. It is highly recommended to sign in to your Microsoft account via a web browser (onedrive.live.com) to reliably complete the storage upgrade.

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