Users may encounter an unexpected error message when attempting to share files and folders in SharePoint Online

Title: Users may encounter an unexpected error message when attempting to share files and folders in SharePoint Online
User impact: Users may have encountered an unexpected error message when attempting to share files and folders in SharePoint Online.
More info: Instead of the expected error message, when users encounter a scenario where they’re unsuccessful in attempting to share files and folders, impacted users encounter the following error: “TypeError: a.indexOf was not a function.”
Final status: We’ve successfully deployed our code fix throughout the affected service environments and we’ve confirmed with affected users that the impact has been successfully remediated.
Scope of impact: Users attempting to share files and folders in SharePoint Online throughout all service environments were impacted.
Start time: Wednesday, January 3, 2024, at 8:00 AM UTC
End time: Friday, January 19, 2024, at 5:00 AM UTC
Root cause: A code issue contained within a recent regularly scheduled service update resulted in cosmetic impact.
Next steps:
– We’re reviewing our update testing and validation methods to better identify the potential for code issues such as this prior to deployment to prevent similar impact in the future.
This is the final update for the event.