In some cases, there can be additional parameters in the URL that are not recognized by Skype for Business Server.

When you are signed in you will see your name and your availability status. When Skype for Business on Mac tries to join a meeting, the client passes the meeting URL to Unified Communications Web API (UCWA).

Enter your NetID password for password, and click Sign In (if prompted, username is or /netid).There is another method to stop Skype from starting. Next time when you start your Mac, you should not see Skype automatically starting. Enter your SBU email address for sign-in address (i.e., and click Sign In or Continue Right click on Skype icon in the Dock while holding Ctrl key.

Select Apple > System Preferences > Sound to set the Output and Input volumes. External users may join a meeting by clicking on the meeting link and using the web app they do not need Skype for Business on their computers to join a meeting and they do not need to sign in. > Audio/Video to select your microphone and speakers.Stony Brook users search for Skype for Business on your computer or download it from the Office 365 portal: /office365.

Skype sign in mac