In the Calendar section of Outlook, click the “New Teams Meeting”
Fill in the Title, Choose any attendees, Choose a date/time
Make sure that your meeting information filled into the body
Click Send when done.
When you initially receive an email about Teams Conferencing, you will receive a host PIN which you will need to enter when you dial into the meeting. If you are joining via the Teams app, you don't need to enter it.
If you need to reset your PIN, there is a self-service link in the meeting body: