When you try to sign in to the Skype for Business 2016 client in Windows 8.1, you may receive the following error messages:

The requested operation was blocked by policy. For more information, contact your system administrator.

There was a problem acquiring a personal certificate required to sign in. If the problem continues, please contact your support team.

NoteĀ This issue usually happens if an admin has set a conditional access policy (the PkeyAuth protocol support) through Intune on the user for signing into the Skype for Business client.


To fix this issue, install the December 5, 2017, update (KB4011563) for Skype for Business 2016.

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!