External Identities are a new feature in Azure AD. We had already B2B, B2C and now we have B2X (see blog post, blog post). The default identity providor is Azure AD but this can be extended with other identity providers like Google, Facebook, etc. B2X offers self-service sign-up user flows (preview) that can be used to give external users access to your apps, based on a guest user account…
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https://2die4it.com/2021/03/04/customize-and-extend-self-service-sign-up-for-guest-users-with-power-automate-flow/
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