Outlook 365 for Mac - MS Teams button is missing

I notice this post is almost 5 years old.... I have the same issue.

I have Office 365 on Mac and in my Outlook, in Calendar, when booking a new meeting I have toogle for Skype but NOT for Teams. Very annoying. I have not used Skype for years. I have search a lot on the net and it advices me to use the drop down meny files and in options klick on Teams as service. There is no options in the new Outlook incarnation nor in the old. Strangely though if I use the Teams calendar it will show in Outlook Calendar with Teams. But I would like to book a meeting in the Calendar part of Outlook using Teams. I need help and hope someone can give a tip. I already tried the licence removal that did not work. In general it is very difficult to understand whether one use office 365 or regular since there is not clear differentiator....