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# Customer intent: As a tenant administrator, I want to make sure that my users can authenticate themselves with one-time passcode.
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# Email one-time passcode authentication
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The email one-time passcode feature is a way to authenticate B2B collaboration users when they can't be authenticated through other means, such as Azure AD, Microsoft account (MSA), or social identity providers. When a B2B guest user tries to redeem your invitation or sign in to your shared resources, they can request a temporary passcode, which is sent to their email address. Then they enter this passcode to continue signing in.
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:::image type="content" source="media/one-time-passcode/email-otp.png" alt-text="Diagram showing an overview of Email one-time passcode.":::
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> [!IMPORTANT]
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### Example
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Guest user teri@gmail.com is invited to Fabrikam, which doesn't have Google federation set up. Teri doesn't have a Microsoft account. They'll receive a one-time passcode for authentication.
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Guest user nicole@firstupconsultants.com is invited to Fabrikam, which doesn't have Google federation set up. Nicole doesn't have a Microsoft account. They'll receive a one-time passcode for authentication.
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## Enable or disable email one-time passcodes
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-**Yes**: The toggle is set to **Yes** by default unless the feature has been explicitly turned it off. To enable the feature, make sure **Yes** is selected.
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-**No**: If you want to disable the email one-time passcode feature, select **No**.
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:::image type="content" source="media/one-time-passcode/email-one-time-passcode-toggle.png" alt-text="Screenshots showing the Email one-time passcode toggle.":::
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1. Select **Save**.
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6. Select **Save**.
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## Frequently asked questions
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**Regarding the change to enable email one-time-passcode by default, does this include SharePoint and OneDrive integration with Azure AD B2B?**
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No, the global rollout of the change to enable email one-time passcode by default doesn't include enabling SharePoint and OneDrive integration with Azure AD B2B by default.To learn how to enable integration so that collaboration on SharePoint and OneDrive uses B2B capabilities, or how to disable this integration, see [SharePoint and OneDrive Integration with Azure AD B2B](/sharepoint/sharepoint-azureb2b-integration).
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No, the global rollout of the change to enable email one-time passcode by default doesn't include enabling SharePoint and OneDrive integration with Azure AD B2B by default.To learn how to enable or disable the integration of SharePoint and OneDrive with Azure AD B2B for secure collaboration, see [SharePoint and OneDrive Integration with Azure AD B2B](/sharepoint/sharepoint-azureb2b-integration).
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## Next steps
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Learn about [Identity Providers for External Identities](identity-providers.md).
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Learn about [Identity Providers for External Identities](identity-providers.md), and how to reset [redemption status for a guest user](reset-redemption-status.md).
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