First, create an account in the Aurinko portal

Create your app, then check API/features that should be activated for your new app. Besides 'Messaging' and 'End usersessions' your addin may need to access CRM APIs.

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You're ready to activate your MS Teams app!

Installing MS Teams app.

Once you've installed the app, opened its tab, and confirmed your id, you'll see a new user record in Aurinko:

Now you frontend code can call Aurinko API on behalf of this user. Read this article for more details.