OneDrive not available in New Outlook after tenant rename

Question

I did a SharePoint tenant rename (https://learn.microsoft.com/en-us/sharepoint/change-your-sharepoint-domain-name) and since than I have not OneDrive available in the new Outlook. When creating a new mail and try to add a file from OneDrive, it's not available. When I try to save an attachment, OneDrive is not an option.

Answer 1

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Hi @Jasper Vermeulen, 

Thank you for reaching out to the Microsoft Q&A forum.  

Based on your description, OneDrive is not appearing in New Outlook when attaching or saving files after the SharePoint domain rename. I appreciate the details you provided and the effort you put into testing this in Outlook on the web. 

After a SharePoint domain rename, OneDrive endpoints move to the new domain and Microsoft creates temporary redirects while the change completes. During this period, Outlook on the web can still reference cached endpoints tied to the old domain, so OneDrive may not show until the session is refreshed and the account reconnects to the new endpoint. 

Below are some alternative steps designed to address your situation effectively:  

1/ Refresh the user session and re‑enumerate cloud locations in Outlook on the web 

• Sign out from all Microsoft 365 web apps, close the browser, then sign back in at portal.office.com to force token refresh and location discovery.  
• Open OneDrive on the web directly using the new domain (for example, https://<newtenant>-my.sharepoint.com) and confirm you can browse your files. This ensures the service is reachable with the updated URL.  
• In Outlook on the web, compose a new email and select Attach → Browse cloud locations. Check that OneDrive is listed, then attach the file either as a link or as a copy.  
• If OneDrive is still not shown, try an InPrivate/Incognito window or clear cached cookies for Office/Outlook domains and repeat the steps.  

2/ Verify rename completion and OneDrive URL mapping in Microsoft 365 

• In the Microsoft 365 admin center and SharePoint admin center, confirm the domain rename shows Completed and users’ OneDrive URLs reflect the new -my.sharepoint.com domain.  
• Validate that the new SharePoint and OneDrive admin URLs are accessible end‑to‑end, and note Microsoft’s one‑year redirect from the prior addresses (useful for old links during transition).  
• Communicate that some background operations occur per site and per OneDrive; availability resumes as each rename completes. If any site still shows the old domain, give it additional time and recheck.  

3/ Review Outlook on the web mailbox policy and Conditional Access 

• Confirm Outlook on the web policies do not restrict cloud attachments. In Exchange Online, ensure ClassicAttachmentsEnabled is True and that ConditionalAccessPolicy isn’t set to a mode that blocks attachment actions for the affected users.  
• If you use device‑based restrictions, be aware that certain Conditional Access plus OWA policy combinations can limit viewing or attaching from cloud locations on unmanaged devices; adjust policies if attaching from OneDrive is required.  
• You can quickly review policy values with PowerShell: 

Get-OwaMailboxPolicy | fl Name,ClassicAttachmentsEnabled,ConditionalAccessPolicy,AdditionalStorageProvidersAvailable 

• Then adjust as needed (example): 

Set-OwaMailboxPolicy -Identity "OwaMailboxPolicy-Default" -ClassicAttachmentsEnabled $true 

4/ Reconnect OneDrive sync client after the rename (if users also use sync) 

• Unlink the old OneDrive account in the sync client, remove cached credentials (Windows Credential Manager / macOS Keychain), and sign in again with the updated tenant domain to re‑establish the sync to the new -my.sharepoint.com path.  
• When prompted, choose the existing local OneDrive folder path if appropriate; the client will compare local files with the cloud and resume syncing under the new domain.  
• After the client is reconnected, test in Outlook on the web: attach from Browse cloud locations and confirm OneDrive appears 

5/ Contact support 

• If the issue persists, open Outlook > Help > Contact Support, and include your Outlook versions. 

As community moderators, we appreciate your understanding that our access to internal development details is limited. Our primary role is to guide users toward the appropriate resources and support channels. While we may not have visibility into deeper backend analysis, we’ll continue doing our best to support you within the scope of our responsibilities.    

I hope this information is helpful. Please follow these steps and let me know if it works for you. If you have any updates regarding the issue, please feel free to share them with me.      

Thank you for your patience and your understanding. I look forward to continuing the conversation. 

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