OneDrive for Business storage quotas show missing users for managed devices: Fix Guide

When you check OneDrive for Business storage quotas in the Microsoft 365 admin center, you may notice that some users with managed devices are missing from the quota list. This problem occurs when the OneDrive sync app has not reported device information to the service, causing the managed device count to appear as zero or blank for those users. The root cause is often a sync configuration issue or a missing registry key on the client computer. This guide explains why users disappear from the quota view and provides step-by-step fixes to restore accurate managed device reporting.

Why Managed Devices Do Not Appear in OneDrive Storage Quotas

The OneDrive for Business storage quota report in the Microsoft 365 admin center displays two key columns: Storage Used and Managed Devices. The Managed Devices column shows the number of computers or mobile devices that have the OneDrive sync app installed and are actively syncing the user’s OneDrive files. When a user is missing from this column, the service has not received a device registration heartbeat from that user’s client.

This missing registration occurs for three main technical reasons. First, the OneDrive sync app on the managed device is not signed in with the correct work or school account. Second, the sync app is running an outdated version that does not send the required device metadata. Third, a Group Policy or registry setting blocks the device from reporting its identity to the Microsoft 365 service. Without a valid device registration, the quota report treats the user as having zero managed devices, even if the sync app is installed and working.

How the Device Registration Process Works

When a user signs in to the OneDrive sync app on a Windows device, the app creates a unique DeviceId GUID and stores it in the Windows registry under HKEY_CURRENT_USER\Software\Microsoft\OneDrive\Accounts\Business1. The sync app then sends this DeviceId along with the user’s UPN to the Microsoft 365 service during each sync cycle. The admin center aggregates these DeviceIds to populate the Managed Devices column. If the DeviceId is missing, corrupted, or never sent, the user appears with zero managed devices.

Steps to Fix Missing Managed Devices in OneDrive Storage Quotas

Use the following steps in order. After each step, check the admin center to see if the user appears in the quota report. Wait up to 4 hours for the service to update.

1. Verify the user’s OneDrive sync app is signed in with the correct account
   On the affected device, open OneDrive in the system tray. Click the OneDrive icon, then select Help & Settings > Settings. Go to the Account tab. Confirm that the account shown matches the user’s work or school email address. If the account is wrong, click Unlink this PC and sign in again with the correct credentials.
2. Update the OneDrive sync app to the latest version
   Outdated sync clients often fail to send device metadata. Open OneDrive settings, go to the About tab, and note the version number. The current production version is 24.001 or later. If the version is older, download the latest OneDrive setup file from the Microsoft 365 admin center or directly from the OneDrive download page. Run the installer and restart the device.
3. Check the DeviceId registry key on the client computer
   Press Win + R, type regedit, and press Enter. Navigate to HKEY_CURRENT_USER\Software\Microsoft\OneDrive\Accounts\Business1. Look for a value named DeviceId. If the value is missing, right-click in the right pane, select New > String Value, name it DeviceId, and set its value to a new GUID generated by the OneDrive sync app. To generate a fresh DeviceId, sign out of OneDrive, delete the entire Business1 key, then sign back in. OneDrive recreates the key with a valid DeviceId during sign-in.
4. Verify that no Group Policy is blocking device registration
   Open the Local Group Policy Editor by running gpedit.msc. Navigate to Computer Configuration > Administrative Templates > OneDrive. Look for the policy setting “Allow OneDrive to report device information”. If this policy is set to Disabled, change it to Enabled or Not Configured. Run gpupdate /force in an elevated command prompt to apply the change, then restart the OneDrive sync app.
5. Reset the OneDrive sync app to force a fresh device registration
   Press Win + R, paste the following command, and press Enter: %localappdata%\Microsoft\OneDrive\onedrive.exe /reset. Wait for OneDrive to restart. After the reset, sign in again with the work or school account. This process clears the old DeviceId and creates a new one, which the sync app immediately sends to the service.
6. Check the admin center for the user’s updated managed device count
   Go to the Microsoft 365 admin center at admin.microsoft.com. Select Reports > Usage > OneDrive. Click the Storage Quota tab. Search for the affected user. The Managed Devices column should now show 1 or more devices. If it still shows 0, repeat steps 3 and 5, then wait 4 hours before checking again.

If Users Still Do Not Appear in the Storage Quota Report

OneDrive sync app shows “This device is not managed”

Open OneDrive settings and go to the Account tab. Under the user’s account, look for the text “This device is managed by your organization.” If the text says “This device is not managed,” the sync app is not receiving the device management policy from Microsoft 365. This usually means the user is not assigned a OneDrive for Business license or the tenant does not have device management enabled. In the admin center, go to Users > Active Users, select the user, and verify that the OneDrive for Business license is assigned under the Licenses and Apps tab. If the license is missing, assign it and wait 30 minutes.

The Managed Devices column shows a higher count than expected

If the count is higher than the number of actual devices, the user may have signed in to OneDrive on multiple computers or virtual machines. Each sign-in creates a separate DeviceId. To remove stale device registrations, go to the Microsoft 365 admin center, select the user, then click the OneDrive tab. Under Devices, click Manage Devices. Select any device that is no longer in use and click Remove. The next sync cycle will update the managed device count.

Storage quota data does not refresh after 24 hours

If the quota report still shows missing users after 24 hours, the issue may be a service-side delay. Open a support ticket with Microsoft 365 support. Provide the affected user’s UPN, the DeviceId from the registry, and the version of the OneDrive sync app. Microsoft support can force a resync of the device registration data on the backend.

OneDrive Storage Quota Report vs Device Registration Report: Key Differences

Item	Storage Quota Report	Device Registration Report (Azure AD)
Data source	OneDrive sync app heartbeat	Azure AD device registration
What it tracks	Number of devices syncing OneDrive files	All devices joined to Azure AD or hybrid AD
Refresh interval	Up to 4 hours	Near real-time
User appears if device is missing	Shows 0 managed devices	Device not listed at all
Fix method	Reset OneDrive sync app or fix registry	Re-join device to Azure AD

The storage quota report only counts devices that run the OneDrive sync app and report a valid DeviceId. The Azure AD device registration report counts all managed devices, including those that do not use OneDrive. If a user has a managed device but no OneDrive sync, the storage quota report will correctly show zero managed devices. To see all managed devices, use the Azure AD device list in the Microsoft Entra admin center.

You can now check the OneDrive storage quota report and confirm that all users with managed devices appear correctly. If a user is still missing, run the OneDrive reset command and verify the DeviceId registry key on that user’s computer. For ongoing monitoring, set up a weekly report in the Microsoft 365 admin center that includes the Managed Devices column to catch missing users early.