Step 1: Login into Microsoft Teams Application from your Laptop/MacBook.

Step 2: From the sidebar, select Calendar.

Step 3: Create a New meeting and add participants. And, Save it.

Step 4: The meeting will appear in the calendar timeline. Right-click and select Join online.

Step 5: Click Join now, to join the meeting right away. If the participant is not joined yet, you can notify him/her. He/she will get an intimation if they're online on Teams.