I knew there were no hardware changes, OS patch changes.

It had been almost a week since I last used Skype, so I wasn’t *certain* what I had changed since my last Skype call. Only to have it hang again, exactly the same way. At first, I dismissed it as some odd intermittent problem, then killed and restarted Skype. If I pressed command-option-escape to view all running applications, the Skype application was listed as “Not responding”. If I tab-switched to the Skype application, the mouse cursor would instantly pinwheel and the Skype menus would not respond to any mouse clicks. When starting Skype, I saw the usual blue Skype window with the white blob moving in a circular pattern to show progress… and after literally one second or maybe two seconds, that blue window would disappear, leaving the Skype icon grayed out on the Mac taskbar. It took a while to debug this, so here are the details of how I fixed it, in case it helps others – or I have to do this again! Specifically, every time I started Skype, it would hang while logging into the Skype network. If you have feedback for TechNet Subscriber Support, to learn more.A few days ago, my Skype stopped working. It will assist others who has similar issue. Mark the reply as an answer if you find it is helpful. Delete all keychains starting with Skype For Business.Open Keychain Access from /Applications/Utilities folder.Go to Finder > press Command+Shift+G > type in /users//library >.In addition, please clean the SFB cache on MAC and refer to the following ways: If it works fine with the above methods, then it might be caused by a client side issue. I suggest that you could update to the latest verision of of SFB Mac client. Skype for Business Basic verison to have a test. Based on your description, the logon issue only affects High Sierra Macs, what if the Mac users log on with other Mac books, does it work?

Skype for mac update problems