And now it seem Microsoft is pushing Teams instead of Skype. There are even two different Teams Apps in Windows 11, one for personal use, one for work.
Same happened with Skype after it was bought by Microsoft, and I seem to recall this is relatively recent. There were (are?) two Skype clients - one for 'personal' (the original Skype) and another for 'enterprise' (rebranded Windows Live for Enterprise possibly?) and not compatible. Again, I recall trying to help confused Windows users figure out why the (incorrect) client wouldn't log-in with certain credentials.
Teams is supposed to completely replace Skype for Business