# Microsoft Resources
https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/howto-troubleshoot-upn-changes
https://learn.microsoft.com/en-us/microsoft-365/admin/add-users/change-a-user-name-and-email-address?view=o365-worldwide
https://learn.microsoft.com/en-us/sharepoint/upn-changes
https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/plan-connect-userprincipalname
> [!Warning]
> Changing a user's UPN can result in wide-spread issues including the following:
> - Any saved links to the user's OneDrive (such as desktop shortcuts or browser favorites) will no longer work and will need to be updated^[https://learn.microsoft.com/en-us/sharepoint/upn-changes#onedrive-url]
> - Teams OneDrive app may not load^[https://learn.microsoft.com/en-us/sharepoint/upn-changes#microsoft-teams]
> - Search results in OneDrive may temporarily use the old URL^[https://learn.microsoft.com/en-us/sharepoint/upn-changes#search-and-delve] Teams