How to Fix OneDrive for Business Sync Error 400 (License Issue)
Question details
Users encounter a 400 Bad Request error when OneDrive for Business stops synchronizing, often accompanied by the OneDrive app disappearing from the Microsoft 365 portal.
- Product
- OneDrive for Business
- Device & OS
- not provided
- Scenario
- Syncing files using OneDrive for Business or third-party synchronization tools connected to a Microsoft 365 account.
- Observed behavior
- Synchronization stops entirely, returning a 400 error code. Additionally, the user's Microsoft 365 portal may no longer display the OneDrive application.
Ensure you have your Microsoft 365 account credentials handy and check if you have administrator privileges to view tenant billing and licensing details.
Verify Your Microsoft 365 License Assignment
Check if your account has the necessary SharePoint and OneDrive licenses to enable synchronization.
The OneDrive 400 Bad Request error typically occurs when the required Microsoft 365 or SharePoint license is missing, expired, or misassigned. Verifying your current subscriptions is the first step to diagnosing the issue.
Go to portal.office.com and log in with your business credentials.
Click on your profile picture in the top right corner and select 'View account'.
Navigate to the 'Subscriptions' or 'Apps and devices' page from the left-hand menu.
Verify if 'SharePoint Plan 1' or 'SharePoint Plan 2' is listed under your assigned licenses. If it is missing, OneDrive will not function.
Contact Microsoft 365 Support for Account Provisioning
Open a support ticket to have Microsoft correct backend provisioning issues if your licenses appear correct but sync still fails.
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Frequently Asked Questions
Why did the OneDrive app disappear from my Microsoft 365 portal?
The OneDrive app icon will disappear from your portal if the SharePoint or OneDrive license has been removed from your account, or if the service failed to provision correctly on the Microsoft backend.
What does a 400 Bad Request error mean for third-party sync tools?
When a third-party synchronization tool encounters a 400 Bad Request error with OneDrive for Business, it means the tool's connection request was rejected. This is usually due to the user's account lacking the required active SharePoint license.
Can I fix the OneDrive provisioning issue myself?
Typically, end-users cannot fix provisioning issues independently. Because license assignments are managed at the tenant level, you will need to contact your organization's IT administrator or have them open a support ticket with Microsoft to resolve the backend error.
