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Re-synced users get a new Onedrive site instead of connecting to their existing one

knowsnothin 1 Reputation point
2026-01-14T13:52:55.6866667+00:00

Hello,

Ive seen this more often lately and Im wondering why it happens and if theres anything we can do to prevent it. This is the issue/scenario:

We're hybrid on-prem/Entra with Entra ID connect. User X is removed from the sync scope and therefore removed from Entra. We have 365 days retention on Onedrive, so the sharepoint online site is still present.

User X is then re-added to the scope and synced again, and instead of simply getting their old sharepoint/onedrive site connected, they get a new one with a 1 added at the end. For example:

Old: https://org-my.sharepoint.com/personal/userX_org_com
New: https://org-my.sharepoint.com/personal/userX_org_com1

User X is still owner on both sites and can access the old one if given the URL. In the past we've seen this on one user here and there, but this week I've seen several.

Anything I can check?

Microsoft 365 and Office | OneDrive | For education | Other
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  1. Jay Tr 12,290 Reputation points Microsoft External Staff Moderator
    2026-01-14T17:27:52.3933333+00:00

    Hi @knowsnothin, 

    Welcome to Microsoft Q&A forum. 

    Thank you for reaching out and sharing detailed information regarding an issue when a user is synced to Entra ID, they are added to a new OneDrive site that has a suffix appended to the expected URL "https://org-my.sharepoint.com/personal/userX_org_com1". In hybrid environment, when a user account is deleted from the sync, and re added to the sync scope, Entra ID creates a new cloud identity for the user. Despite of having identical user principal name, the internal identity identifier is different from the original one. SharePoint and OneDrive rely on this internal identifier to associate the account with their personal site. 

    As a result, when the re-synced user signs in, OneDrive does not recognize the existing retained site as belonging to the new identity. To avoid conflicts, the service provisions a new OneDrive site and appends a number to the URL, such as adding “1” at the end. The original site remains intact and accessible because it is still within the retention period, which is why the user may appear as an owner on both sites. 

    This behavior is expected in scenarios where a synchronized user account is removed and later recreated, and it explains why you may see this occur sporadically or in batches depending on recent directory changes. 

    To resolve the issue, you will need to run the Site User Mismatch diagnostic by using a SharePoint administrator account. Please follow these steps to resolve the site mismatch: 

    1. Click here to run the Site User ID Mismatch tests. 
    2. When prompted, provide the following information: 
    • The affected user account, such as ******@company.com. 
    • The original site URL, such as "https://org-my.sharepoint.com/personal/userX_org_com".
    1. The diagnostic will check for an identity mismatch and, if eligible, re-associate the original OneDrive site with the current user account. 
    2. Once completed, the newly created duplicate OneDrive site can be safely removed, and the user will continue using their original site. 

    Please note that changes may take some time to fully propagate across the service after the diagnostic completes. 

    For more information regarding the issue, please visit this document from Microsoft Fix site user ID mismatch in SharePoint or OneDrive - SharePoint | Microsoft Learn 

    In addition, because the issue involves backend identity mappings between Microsoft Entra ID and SharePoint Online/OneDrive that may notbe fully validated or corrected from the tenant admin side alone, we recommend using your organization's administrator account to submit a support request through the Microsoft 365 Admin Center for further assistance. Please take the following steps to create a support ticket to Microsoft: 

    1. Sign into Microsoft 365 admin center using your Global admin account, on right bottom corner click on "Help & support"      

    User's image

    1. Choose the "Contact Support" tab on the top.  
    2. Select your preferred contact method. 
    3. Enter "OneDrive personal site duplication after hybrid user re-sync (Site User ID mismatch)" in the title input. 

    User's image

    1. Click on the "Contact me" button to submit your request. Which will give them a ticket number.  
    2. Once your request is submitted, a support engineer will be assigned to your case and will contact your admin to provide assistance.  

    Note: We appreciate your understanding regarding the scope of support available through this forum. As moderators, our role is to provide general guidance and assist with common troubleshooting steps. While we do not have access to internal systems or administrative tools required to resolve account-specific or backend-related issues but we’ll continue doing our best to support you within the scope of our responsibilities.    

    I hope this information is helpful. Please follow the steps above and let me know if it works for you. If not, we can continue working together to resolve the issue.  

    Thank you for your patience and understanding. If you have any questions or need additional assistance, please don’t hesitate to reach out so I can continue to support you. If you found the response useful, please consider marking it as accepted, as this may help other community members who are looking for similar guidance.  

    I look forward to continuing the conversation.   

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.     

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  2. AI answer

    2026-01-14T13:53:07.88+00:00

    When a user account is removed from the sync scope and then re-added, it can lead to the creation of a new OneDrive site instead of reconnecting to the existing one. This typically happens because the original OneDrive site is still retained during the retention period, but the new user account created during the sync process has a different ID value. As a result, the new OneDrive site is assigned a URL that includes a suffix (like a number or GUID) to differentiate it from the old site.

    To prevent this issue, ensure that the user accounts are properly managed during the sync process. Here are some steps you can take:

    1. Check User Principal Name (UPN): Ensure that the UPN for the user is consistent and that any changes to the UPN are reflected correctly across your systems.
    2. Use the Diagnostic Tool: Utilize the diagnostic tool provided by Microsoft to check for user ID mismatches and to reconnect users to their original OneDrive sites. This tool can help automate the process of resolving these issues.
    3. Monitor Sync Scope Changes: Keep track of any changes to the sync scope and ensure that users are not frequently removed and re-added, as this can lead to complications with their OneDrive sites.

    If users are experiencing access issues, they may need to be reconfigured to regain access to their original OneDrive sites. The diagnostic tool can assist with this as well.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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