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LeroyG's avatar
LeroyG
Tin Contributor
Aug 18, 2026

**bleep**. Security Update (like KB5101650) breaking SmartCard Authentication for Office 2024 apps to O365

Looking for some support on this issue. I have Win11 clients that were upgraded from 24H2 to 25H2 last year. They were functioning well until earlier this year when the Cumulative Updates started breaking smartcard authentication on our clients (day after installing/rebooting/cache clearing). This seems to be a known issue but are there any real fixes? Symptom is that after the update is installed, next day (after a reboot or cache cleared) the user starts their Outlook or Teams application, when receiving the prompt that says "you will be prompted for your PIN" nothing follows, you will see the blue dots circling and after 5 or so minutes it times out. Clicking on the "..." shows an informational message error #50058, which says that not enough information was provided. The authentication process is failing... BTW - web authentication works just fine, it's just the local application (Teams, Outlook, etc.) that fail. 

I found that creating a new account on the system seems to work just fine, but for people that have established accounts and program environments that are setup for them to work, creating a new account is very unappealing to them. I'd like to be able to just get their current accounts working. Creating a new profile, wiping current profile info from registry doesn't seem to work thanks to automagic backups the OS is doing, but even that would still require setting up a new profile and copying over non AAPDAT file structure info... Does Microsoft not have a fix to this "known" issue? I spent a few weeks really digging into this and the best I can find as a work around is to disable the automatic backups of the NTUSER.DAT, blow away current profile info in registry, rename current profile structure, and then have the user login "anew". Again, this still requires a copy of the non-AAPDAT data back into the new structure (at least permissions won't be an issue) but that will not restore all application-based information for that user--that still will have to be re-created, which I think the users will not want to do because it means starting over from scratch. 

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