Enable this feature in the Power Platform admin center :
Add a Teams meeting to an appointment
From the left navigation pane, select Activities, then from the list of activities, select an existing appointment or select Appointment on the command bar to create a new one :
Enter the required information, then in the Details section, set the Teams meeting toggle to Yes :
Click Save when done. Note that it may take a couple of minutes for the meeting to sync with Outlook and for the meeting link to appear in the appointment.
Join a Teams meeting from an appointment
Open an appointment activity, then choose one of the following ways to join the meeting :
On the command bar, select Join Teams Meeting, or…
…from the Details section, select the Join Teams Meeting link, or…
…from the Description section of the appointment and select Click here to join the meeting.
Follow the instructions on the screen and choose how you want to join the Teams meeting :