Attaching a OneDrive file through a web add-in causes recipient access errors in classic Outlook

Last Updated: October 31, 2025

ISSUE

When you use classic Outlook to attach a OneDrive file as a link, where a web add-in is handling send time events, recipients cannot access the links in your message. 
 
Performing the following steps will exhibit the issue: 

1. Create a new email message.

2. Select Include from the ribbon and select Attach File.

3. Select a file located in your Microsoft OneDrive for Business.

4. Choose Share Link instead of Attach as Copy.

5. The link appears highlighted blue.

6. You select Send and a prompt appears briefly saying "We are still checking if recipients can access links in this message" to check permissions.
   
   

7. Prompt resolves to "Recipients can access links in your message".
   
   ​​​​​​​

8. You send the email, and it successfully sends the message.

9. The recipient opens the message and is unable to access link. 

STATUS: FIXED

Fix will go to Beta Channel in Version 2512 Build 19430.15000 ETA early November 2025, Update History for Office Beta Channel. 

Fix will go to Current Channel in Version 2512 Build 19530.20000 ETA late December 2025, Update history for Microsoft 365 Apps (listed by date). 

Additional Resources

Shareable links in Outlook

Links

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See Also

Fixes or workarounds for recent issues in classic Outlook for Windows