Some Windows 10 users have reported a problem connecting to Skype for businesses (Office 365). The error message “There was a problem when purchasing a personal certificate needed to connect. If the problem persists, please contact your support team who are blocking access to their Skype accounts for businesses.
This problem can be caused by software or certificate conflicts.
What is the cause of this Windows error?
This problem can occur if one or more of the following conditions are met:
The software is obsolete.
- The Lync client is obsolete.
- The connection wizard for Microsoft Online Services is obsolete.
- Certificates cannot be purchased or validated.
- Skype Personal Certificate for online businesses or cached credentials are corrupted or outdated.
- Part of the certificate chain is unreliable and the certificate chain is not validated.
Clear the Skype for businesses cache
- Go to “C:\Users\AppData\Local\Microsoft\Office\16.0\Lync” and delete the Session Initiation Protocol (sip) folder for each user.
- Go to “C:\Users\Erwin\AppData\Local\Microsoft\Office\16.0\Lync\Tracing\” and delete all files. DO NOT DELETE ANY FILES.
- Open the registry editor (Start + R -> Type regedit -> Enter), go to “HKEY_CURRENT_USER\Software\Microsoft\Microsoft\Microsoft\office\16.0\Lync” and delete the folder from the user’s extensible sip profile (the one containing his email address to connect to Skype):
- Clear Skype’s cache
Delete RSA
When deleting the Lync (or Skype) cache, we must also delete the RSA (encryption key). To do that: read more