![]() When it's blocked, Basic authentication in Exchange Online is blocked at the first pre-authentication step (Step 1 in the previous diagrams) before the request reaches Azure Active Directory or the on-premises IdP. The policies define the client protocols where Basic authentication is blocked, and assigning the policy to one or more users blocks their Basic authentication requests for the specified protocols. You block Basic authentication in Exchange Online by creating and assigning authentication policies to individual users. How Basic authentication is blocked in Exchange Online The steps in federated authentication are described in the following diagram:Įxchange Online sends the username and password to the on-premises IdP.Įxchange Online receives a Security Assertion Markup Language (SAML) token from the on-premises IdP.Įxchange Online sends the SAML token to Azure Active Directory. ![]() Note: When Basic authentication is blocked, it's blocked at this step.Įxchange Online sends the username and password to Azure Active Directory.Īzure Active Directory returns a user ticket to Exchange Online and the user is authenticated. The email client sends the username and password to Exchange Online. The steps in cloud authentication are described in the following diagram: For more information, see Choose the right authentication method for your Azure Active Directory hybrid identity solution. These authentication models are described in the following sections.
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