When attempting to add contacts to your Skype for Business contact list you receive the following error:
There are a number of different causes for this error, but the most common solution is to delete the SIP profile for the Skype for Business user. To delete the SIP profile for a user on a Windows workstation, follow the instructions below:
- Close Skype for Business completely by expanding the menu in the client next to the cog. Then select file > exit.
- Open Windows Explorer and navigate to the following folder:
Skype for Business 15 - %localappdata%\Microsoft\Office\15.0\Lync
Skype for Business 16 - %localappdata%\Microsoft\Office\16.0\Lync
- Delete the sip_username directory that matches the sip address of the user experiencing the issues. This directory will be rebuilt when the Skype for Business client is restarted the next time.
- Restart the computer.
- Restart the Skype for business client.
The SIP profile folder and cached information will be rebuilt and the issues above should be resolved.