-- Legacy Exchange Online tokens will be turned off for all organizations from August 2025 through September 2025. Once turned off, you can't use the _AllowLegacyExchangeTokens_ switch on the **Set-AuthenticationPolicy** cmdlet to turn on these tokens. If you receive the error "Legacy Exchange Online tokens are disabled" when you run the command `Get-AuthenticationPolicy -AllowLegacyExchangeTokens`, you can request an exception by [creatin a request through Microsoft Support](https://aka.ms/LegacyTokensByOctober). 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).
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