- As of February 17, 2025, legacy Exchange tokens are blocked by default in all cloud-based organizations. Although tokens are blocked by default, the AllowLegacyExchangeTokens switch will still return `Not Set` if you haven't used the _AllowLegacyExchangeTokens_ or _BlockLegacyExchangeTokens_ parameters on the **Set-AuthenticationPolicy** cmdlet. For more information, see [Nested app authentication and Outlook legacy tokens deprecation FAQ](https://learn.microsoft.com/office/dev/add-ins/outlook/faq-nested-app-auth-outlook-legacy-tokens#what-is-the-timeline-for-shutting-down-legacy-exchange-online-tokens).
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