Correct OSX Interface Inconsistencies
OSX has user interface standards, please use them like you do for other applications. Specifically your notifications really have to be made part of the OSX standard notifications system. Same on Win10 actually. Other O365 Office apps already do this.
Second, put the settings in the "Preferences" section under the app menu like the OSX standard requires. You can leave it in the image as well, but OSX users look for settings in the Preferences menu below the Application "Named" menu (first one after the system Apple menu to the right).
The notifications thing is just awful both on OSX and Windows.
agree. Teams has AWFUL OS X UX and system compatibility.