Some users may be unable to load pages with custom apps or webparts in SharePoint Online and get an error
ID: SP1187718
Issue type: Incident
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Impacted services
SharePoint Online
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Details
Title: Some users may be unable to load pages with custom apps or webparts in SharePoint Online and get an error
User impact: Users may have been unable to load pages with custom apps or webparts in SharePoint Online and got an error.
More info: The following error may have been encountered by users when attempting to load an affected page:
An error occurred during the compilation of the requested file, or one of its dependencies. 'Microsoft.SharePoint.IdentityModel.SPAuthFlightController' does not contain a definition for 'IsRemoveRedirectWithProofTokenOnSignInPageEnabled'
Final status: We've completed the deployment of our fix and confirmed that impact has been fully resolved for all users.
Scope of impact: Some users may have been unable to load pages with custom apps or webparts in SharePoint Online and got an error.
Start time: Tuesday, November 11, 2025, at 12:36 AM UTC
End time: Monday, November 24, 2025, at 6:38 AM UTC
Root cause: A recent change intended to update the authentication flow mistakenly removed a necessary authentication component, resulting in impact.
Next steps:
- We're reviewing our change testing and validation procedures to identify opportunities to improve impact detection and prevent similar future occurrences.
This is the final update for the event.
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