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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / Business Central Excel...
Small and medium business | Business Central, N...
Suggested Answer

Business Central Excel Add-in failing to authenticate

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Posted on by LV-06051402-0 8
Hi, we have multiple users from multiple companies experiencing the following authentication error:
 
 
Please sign in with a user account associated with the server: https//exceladdinprovider.smb.dynamics.com error see https://aka.ms/msal.js.errors#timed_out for details
 
Has anyone come across this error and found a solution?
The following has NOT resolved the error:
Signing out of D365 Office accounts. 
Signing out of BC and back in.
Signing out of Excel.
Ensuring that EXCEL EXPORT ACTION is selected on the User Card as a permission set also does not give the user the ability to launch the excel add-in
Categories:
Dynamics 365 Business Central
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  • Suggested answer
    OussamaSabbouh Profile Picture
    OussamaSabbouh 15,140 Super User 2026 Season 1 on at
    Hello,
    since this affects multiple users / multiple companies and sign-out + permission set changes didn’t help, I’d treat it as an Office add-in authentication/network issue, not a BC user permission issue. The key thing to check is whether users’ machines/network can reach the required Excel add-in endpoints; Microsoft specifically lists https://exceladdinprovider.smb.dynamics.com, https://api.businesscentral.dynamics.com, https://az689774.vo.msecnd.net, and https://dc.services.visualstudio.com, plus Microsoft Entra sign-in endpoints like https://login.microsoftonline.com. The msal.js timed_out message usually means the sign-in page/token flow is not completing, often due to proxy, firewall, VPN, SSL inspection, blocked cookies/cache, or an Office add-in runtime issue. I would test one affected user on a different network/hotspot and also test Excel for web; if it works there, it is almost certainly local network/device policy. Also try clearing the Office add-in cache/reinstalling the Microsoft Dynamics Office Add-In, and confirm the server URL in the add-in is exactly https://exceladdinprovider.smb.dynamics.com. If all companies are affected at the same time, check Microsoft 365/BC service health and open a Microsoft support ticket with the timestamp, tenant, user, and error details.
    Regards,
    Oussama Sabbouh
  • Suggested answer
    Gregory Mavrogeorgis Profile Picture
    Gregory Mavrogeorgis 1,172 Super User 2026 Season 1 on at
    Hi,
     
    This is a known issue from the May 1, 2026 MSAL update — same root cause for BC and F&O.
    Cause: an update to the Microsoft Authentication Library (MSAL) is causing timeout and sign-in loop issues in the Dynamics Office Add-in. Started around 1 May 2026. Microsoft has a known-issue ticket open: https://admin.powerplatform.microsoft.com/support/knownissues/6355973
     
    Fix order — try in this sequence:
     
    Clear the Wef add-in cache. Close Excel completely (kill any leftover EXCEL.EXE in Task Manager), then delete the contents of %LOCALAPPDATA%\Microsoft\Office\16.0\Wef. Reopen Excel and try again.
     
    If that doesn't work, also clear the Identity cache. Win+R → paste %LOCALAPPDATA%\Microsoft\IdentityCache\ → delete contents. Then re-sign into Excel itself (File → Account) and reopen the add-in.
     
    Clear the Office credential cache in Windows Credential Manager (Control Panel → User Accounts → Credential Manager → Windows Credentials) — remove anything starting with MicrosoftOffice16_Data: or referencing dynamics.com.
     
    As a last resort, uninstall the Microsoft Dynamics Office Add-in from Excel (Insert → My Add-ins → Manage → Remove), then reinstall from AppSource.
     
    On the EXCEL EXPORT ACTION permission — that controls whether the Edit in Excel button appears in BC, not whether the add-in itself can authenticate. So it's unrelated to this MSAL error. If users can't see the action at all, give them the D365 EXCEL EXPORT ACTION permission set (or include it in their main role).
     
    ✅ Tick the checkbox below to mark the answer as verified, if it helped resolve your question.
     
    Regards
    Gregory Mavrogeorgis
     
     
  • Suggested answer
    AndrewThomas81 Profile Picture
    AndrewThomas81 809 on at
    Sign out on the add in for Excel and sign back in
     
    Kind Regards
     
    Andrew Thomas FCCA MCP
    YouTube - Use Business Central
    LinkedIn
     

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