There are many ways to schedule a meeting on Teams but the two main ones are through Teams application and from Outlook calendar.
External users can always be invited by typing their full email address in the list of participants. They will be able to join the meeting directly from their browser.
From Teams directly (More Info)
Meeting creation form can be accessed:
- via the Calendar tab, then Schedule a meeting button
- directly from a conversation, via the Schedule a meeting icon
From Outlook WebApp
When creating a meeting, select Add online meeting in the location field.
From Outlook on Windows (More Info)
In Outlook calendar, click on New Teams Meeting in the ribbon.
