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Download the Microsoft Teams app on your mobile device.
Go to the email with the invitation and click on 'Participate'.
The app will start automatically. Click 'Join as Guest'. Enter your name then click 'Join Now' to start the conversation.
If you show up for the appointment earlier than the practitioner, you may have to wait a while until the practitioner allows you to join the conversation. If the practitioner also appears in the conversation, you can see and hear him or her.