There might be this topic or rumour going around Office 365 right now. Skype for Business will be obsolete. It is actually true. When I logon to my newly registered Office 365 in Skype for Business then I go the following page saying “You organisation is now using Microsoft Teams”. Skype for Business will just paralyse.
In your Office 365 main page you will find Teams.
Click on that your Teams will launch in browser. There is a desktop version as well. You can then create your team and add your team member.
You can chat with then like the picture showing below. Good bye Skype for Business.