Just installed the new macOS version of Skype - version 8.*.* and what a S**T load of rubbish. Even the Skype macOS forum is upto 50 pages since December 2. The list of problems let alone the comments concerning the new UI is way to numerous to list here.
My biggest problem (and for a lot others) is Skype did not recognise my 10 year old log in details.
In the end I just reverted to my last version 7.59 (37) which Microsoft are calling "Classic Skype". For those who want to downgrade:
Be sure to look for a white menu arrow inside the blue download button - select Skype Classic from within that menu.