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Users may be unable to open the SharePoint and Microsoft OneDrive file picker in Agent Builder within Microsoft Copilot

Microsoft Copilot (Microsoft 365) CP1528420

Users may be unable to open the SharePoint and Microsoft OneDrive file picker in Agent Builder within Microsoft Copilot.

Status
Investigating
Feature
General
Region
Europe, Asia Pacific
Started
Oct 28, 2026, 06:24 CET
Duration
2 h 22 min
Last update
Oct 28, 2026, 06:52 CET
Next update
Oct 28, 2026, 21:00 CET

Current status

We've identified that a recent update to the Microsoft 365 Copilot app changed how it handles SharePoint and OneDrive sign-in requests and is causing the affected requests to be passed to the app in an older format, resulting in authentication failures when users open the cloud file picker to add knowledge. We're deploying a code fix that we've developed and we estimate that it'll complete deployment by our next scheduled communications update.

More info

Specifically, opening the SharePoint and OneDrive file picker to add knowledge fails with the following message:
"Failed to authenticate. Please try again."

To bypass impact, users may go to Knowledge, then Add knowledge, paste the SharePoint and OneDrive file or site URL into the search box instead of using the cloud picker.

Scope of impact

Users located in Europe, United State, and Japan attempting to open the SharePoint Online and OneDrive file picker in Agent Builder within Microsoft Copilot may be impacted by this event. This section may be updated as our investigation continues.

Root cause

A recent update to the Microsoft 365 Copilot app changed how it handles SharePoint and OneDrive sign-in requests and is causing the affected requests to be passed to the app in an older format, resulting in authentication failures when users open the cloud file picker to add knowledge.

Timeline

Every update Microsoft posted for this issue, newest first.

  1. Oct 28, 2026, 06:52 CET

    We've identified that a recent update to the Microsoft 365 Copilot app changed how it handles SharePoint and OneDrive sign-in requests and is causing the affected requests to be passed to the app in an older format, resulting in authentication failures when users open the cloud file picker to add knowledge. We're deploying a code fix that we've developed and we estimate that it'll complete deployment by our next scheduled communications update.

  2. Oct 28, 2026, 06:30 CET

    We're investigating a potential issue with Microsoft Copilot and checking for impact to your organization. We'll provide an update within 30 minutes.

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To see whether your own tenant is affected, check Service health in the Microsoft 365 admin center. Only a backup outside Microsoft protects against data loss, and only a tested break-glass account against locked-out admins. We set up both in fixed-scope sprints.

Source: Microsoft Graph, Service Communications API. This is the view of a Swiss Microsoft 365 tenant: services not licensed there are missing, and individual issues may affect your tenant differently. Microsoft names the region only in the issue text. The Switzerland view shows issues for Switzerland, for Europe in general and those without a region, but not issues that only name other countries such as Germany or the UK. This page is not provided by Microsoft.