- Log out of and quit Skype for Business
- Go to Finder
- Press Command+Shift+G or click Go > Go to Folder
- Type ~/library and press Return
- Delete the following bold files:
- Containers > com.microsoft.SkypeForBusiness
- Internet Plug-Ins > MeetingJoinPlugin.plugin
- Logs > LwaTracing
- Saved Application State > com.microsoft.SkypeForBusiness.savedState
- Preferences > com.microsoft.skypeforbusiness.plugin.plist