During the past years, I have seen a lot of questions about setting up users who are not part of the Azure AD tenant linked to a Dynamics 365 Finance and Operations environment. Usually, there is a simple reply by stating that the Provider field on the User details should be altered to indicate where to authenticate the user. This reply does not cover the licensing requirements, components that require an app registration in Azure AD, and users not part of an Azure AD, but having e.g. a Microsoft Account. With this post, I will provide the full details to correctly enable external users.

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