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Copy file name to clipboardExpand all lines: docs/outlook/faq-nested-app-auth-outlook-legacy-tokens.md
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ms.service: microsoft-365
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ms.subservice: add-ins
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ms.topic: faq
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ms.date: 12/10/2024
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ms.date: 12/12/2024
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---
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# Nested app authentication and Outlook legacy tokens deprecation FAQ
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### Can I turn Exchange Online legacy tokens back on?
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Yes, there are PowerShell commands you can use to turn legacy tokens on or off. Currently the commands are only intended for use in test tenants and testing Outlook add-ins. Don't use them in production tenants or you'll see side effects. We'll update the commands soon so that they can be used in production tenants as well. We'll update this FAQ with additional information once the commands can be used in production tenants.
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Yes, there are PowerShell commands you can use to turn legacy tokens on or offin any tenant. For more information on how to turn legacy tokens on or off, see [Turn legacy Exchange Online tokens on or off](turn-exchange-tokens-on-off.md).
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For more information on how to turn legacy tokens on or off, see [Turn legacy Exchange Online tokens on or off](turn-exchange-tokens-on-off.md).
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In June 2025, legacy tokens will be turned off and you won't be able to turn them back on without a specific exception granted by Microsoft. In October 2025, it won't be possible to turn on legacy tokens and they'll be disabled for all tenants. We'll update this FAQ with additional information once the tool is available
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In June 2025, legacy tokens will be turned off and you won't be able to turn them back on without a specific exception granted by Microsoft. In October 2025, it won't be possible to turn on legacy tokens and they'll be disabled for all tenants. We'll update this FAQ with additional information once the tool is available.
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ms.service: microsoft-365
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ms.subservice: add-ins
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ms.topic: how-to
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ms.date: 11/26/2024
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ms.date: 12/12/2024
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---
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# Turn legacy Exchange Online tokens on or off
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For more information about deprecation of legacy Exchange Online tokens, see [Nested app authentication and Outlook legacy tokens deprecation FAQ](https://aka.ms/NAAFAQ).
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> [!WARNING]
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> Only use the commands in this article on a test tenant for testing your Outlook add-ins. Don't use these commands on a production tenant. They can affect some essential Outlook services that can cause issues for users.
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## Connect to Exchange Online PowerShell
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To run the commands you need to connect to Exchange Online PowerShell.
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You’ll only be able to turn on tokens back on until June 2025 when all legacy tokens in all tenants will be forced off. For more information, see the [Nested app authentication and Outlook legacy tokens deprecation FAQ](https://aka.ms/NAAFAQ).
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You’ll only be able to turn tokens back on until June 2025 when all legacy tokens in all tenants will be forced off. For more information, see the [Nested app authentication and Outlook legacy tokens deprecation FAQ](https://aka.ms/NAAFAQ).
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> [!NOTE]
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> It might take up to 24 hours for the change to take effect across your entire organization. Legacy Exchange tokens issued to Outlook add-ins before token blocking was implemented in your organization will remain valid until they expire.
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## See also
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-[Nested app authentication and Outlook legacy tokens deprecation FAQ](https://aka.ms/NAAFAQ)
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-[Enable SSO in an Office Add-in using nested app authentication](../develop/enable-nested-app-authentication-in-your-add-in.md)
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