In the Microsoft 365 admin center, go Settings > Org Settings > Modern Authentication. However, for tenants created before August 1, 2017, modern authentication is turned off by default. To use Modern Authentication, make sure that it is enabled. It uses time-limited tokens, and applications don’t store user credentials. Modern Authentication is based on Active Directory Authentication Library and OAuth 2.0. Modern Authentication is now enabled by default for all new Microsoft 365/Azure tenants because this protocol is more secure than the deprecated Basic Authentication. Adding code to get an authentication token from a token server.Use the Microsoft 365 admin center to enable or disable IMAP, POP, SMTP AUTH on specific mailboxes.Use Modern Authentication with IMAP, POP or SMTP Clients.Use modern authentication with EwsClient.App registration with Azure Active Directory.
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