Can’t sign in to Skype – There was a problem acquiring a personal certificate required to sign in

Posted by erwin on Tuesday, December 12, 2017

 Problem:

Skype Error message when signing in: “Can’t sign in to Skype for Business – There was a problem acquiring a personal certificate required to sign in. If the problem continues, please contact your support team”.

Uninstalling or reinstalling Office 365 software is not going to help you. There are a couple of solutions here.

Solution 1

Open Skype for Business login window and click on “delete my sign-in info”. Then – type in the login details and password again and try to log in.

Skype delete my sign-in info

Solution 2

Clear Skype for Business’s cache:

  1. Go to “C:\Users<username>\AppData\Local\Microsoft\Office\16.0\Lync” and delete the specific user’s sip (Session Initiation Protocol) folder.
  2. Go to “C:\Users\Erwin\AppData\Local\Microsoft\Office\16.0\Lync\Tracing\” and Delete All files. DO NOT DELETE ANY FOLDERS.
  3. Open the registry editor (Start + R -> type regedit -> Enter), go to “HKEY_CURRENT_USER\Software\Microsoft\office\16.0\Lync” and delete the specific user’s expandable sip profile folder (the one that contains the user’s email address to sign in to Skype):

Clear Skype’s cache


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