Microsoft Teams - FAQs - What Basic Profile Information Is Read When Allowing the Permission OpenID?

By using this permission, an app can receive a unique identifier for the user in the form of a sub claim. The permission also gives the app access to the UserInfo endpoint. The OpenID scope can be used at the Microsoft identity platform token endpoint to acquire ID tokens. The app can use these tokens for authentication. More info on https://learn.microsoft.com/en-gb/graph/permissions-reference