Your application needs to access the web API as the signed-in user, but access is limited by the selected permissions. It notably adds support for multifactor authentication, in which a secondary challenge besides a password is used to verify a user's identity, such as previously set personal questions. Modern authentication is based on the use of OAuth 2.0 tokens and the Active Directory Authentication Library. Basic Authentication will not be supported after that and configuring MigrationWiz to use Modern Authentication will be required. Terminology Basic Authenticationīasic Authentication is no longer supported between MigrationWiz and Exchange Online endpoints as of the end of December 2022 due to Microsoft discontinuing support for Basic Authentication in Exchange Online. The specific authentication needed, and the steps to enable it, will be found in the migration guide for your specific scenario. This article covers the various types of authentication, what scenarios they apply to, and special cases. Authentication and permission management for Microsoft 365 can be complex and varies by type.