Box Cloud Storage Error Code invalid_grant: How to Fix It

Easy 5-15 minutes High Severity Verified June 2026
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Error Code
invalid_grant
Brand
Box
Product Type
cloud_storage
Severity
High
DIY Difficulty
Easy
Estimated Fix Time
5-15 minutes
The Box invalid_grant error occurs when your OAuth refresh token has expired or been revoked, typically after 60 days of inactivity. This authentication error prevents you from accessing your Box files and requires re-authorization to restore connection.
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Tools You'll Need

How to Fix Error Code invalid_grant

  1. Sign Out of All Box Sessions

  2. Clear Browser Cache and Cookies

    This will sign you out of other websites, so have passwords ready for sites you visit frequently

  3. Re-authenticate Your Box Account

  4. Reconnect Third-Party Applications

  5. Update Box Desktop App

    Back up any unsaved work before updating desktop applications

  6. Verify Account Status

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When to Call a Professional

Contact Box support if the error persists after re-authentication, if you're unable to access your account credentials, or if you're part of a business account that requires IT administrator assistance for OAuth token management.

Frequently Asked Questions

What causes the Box invalid_grant error?
The invalid_grant error occurs when Box's OAuth refresh tokens expire (typically after 60 days of inactivity) or are revoked due to security reasons, password changes, or account policy updates.
Will I lose my files when fixing the invalid_grant error?
No, your files stored in Box cloud storage are safe. The invalid_grant error only affects authentication and access, not your actual data. Re-authenticating will restore access to all your files.
How can I prevent the Box invalid_grant error from happening again?
Use Box regularly (at least once every 60 days), keep your applications updated, and avoid changing your Box password frequently. For business accounts, work with your IT team to implement proper token refresh policies.
Why does Box require OAuth re-authentication?
Box uses OAuth tokens for security. These tokens expire automatically to protect your account from unauthorized access, especially if your credentials are compromised or your account remains inactive for extended periods.
Can the invalid_grant error affect Box mobile apps?
Yes, the invalid_grant error can affect Box mobile apps, desktop sync clients, and any third-party applications connected to Box. All will need to be re-authenticated after fixing the token issue.

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