Microsoft Purview DLP policy with "Block", "Allow users to override", and "Require business justification" settings

RajivKumar-1104 0 Reputation points
2026-06-18T06:17:54.7066667+00:00

Hi,

We have configured a Microsoft Purview DLP policy with "Block", "Allow users to override", and "Require business justification" settings. The Business Justification Override prompt is working as expected in Outlook Desktop and Outlook on the Web, as shown in the attached screenshot.

However, in Outlook for Android (latest version), users do not receive the Business Justification prompt when attempting to send a message that matches the same DLP policy.

Based on Microsoft 365 Roadmap ID 496146 and Microsoft documentation regarding Outlook Mobile DLP Policy Tips and Override capabilities, we expected the override experience to be available on mobile devices as well.

Could you please confirm:

  1. Is Business Justification Override fully supported in Outlook Mobile (Android/iOS)?
  2. If supported, what minimum Outlook Mobile version and licensing requirements are required?
  3. Is the full justification dialog (predefined justification options, custom justification text, and acknowledgment checkbox) expected to appear on mobile devices?
  4. Are there any known limitations, feature rollouts, or configuration requirements specific to mobile clients?

Regards,

Rajiv Kumar

Microsoft Security | Microsoft Purview
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  1. Pilladi Padma Sai Manisha 10,770 Reputation points Microsoft External Staff Moderator
    2026-06-22T08:50:39.91+00:00

    Hi @RajivKumar-1104
    Since the Business Justification override experience is working as expected in Outlook Desktop and Outlook on the Web (OWA), the Microsoft Purview DLP policy configuration itself appears to be functioning correctly.

    Regarding Outlook for Android/iOS, Microsoft has introduced DLP override capabilities for Outlook Mobile (Microsoft 365 Roadmap ID 496146). However, Outlook Mobile does not yet have full feature parity with Outlook Desktop and OWA, and the availability of the override experience can depend on factors such as tenant rollout status, Outlook Mobile version, and platform-specific limitations.

    At this time, the complete Business Justification experience (predefined justification options, custom justification text, and acknowledgment checkbox) is not guaranteed to match the Desktop/OWA experience on mobile devices.

    Please verify the following:

    • Ensure users are running the latest version of Outlook for Android/iOS.
    • Confirm the mailbox is hosted in Exchange Online.
    • Verify that users have the appropriate Microsoft Purview/Microsoft 365 licensing (for example, Microsoft 365 E5, Microsoft 365 E5 Compliance, or equivalent licensing).
    • Check whether users see any DLP policy tip/banner on mobile, or whether the message is blocked or sent without any prompt.

    If the override prompt consistently appears in Outlook Desktop and OWA but not in Outlook Mobile, this is more likely related to mobile feature rollout or current client limitations rather than a DLP policy misconfiguration.

    To help narrow this down further, please share:

    • The Outlook for Android/iOS app version.
    • Whether the issue occurs for all users or only specific users.
    • Whether the mobile client displays any DLP notification at all when the policy is triggered.

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  2. RajivKumar-1104 0 Reputation points
    2026-06-18T06:23:43.6533333+00:00

    Below is the notification that appears in Outlook Desktop; however, the same notification is not displayed on mobile devices.

    User's image

    Regards,

    Rajiv Kumar

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  3. AI answer

    2026-06-18T06:18:23.58+00:00
    1. Business justification override is supported for Outlook for Android and iOS when using Microsoft Purview DLP, but only through the oversharing dialog experience that is enabled in the DLP rule. The oversharing dialog can present warning, override, or block actions to end users who are sharing labeled or sensitive emails in Outlook for Android and iOS.
    2. Outlook for Android and iOS support the oversharing dialog “when used with the necessary licenses and configuration.” The exact minimum client version and specific licensing SKUs are not detailed in the provided documentation. The feature requires that the DLP rule be configured with policy tips and user overrides (Notify + Block + AllowOverride, optionally with justification/false positive) as described in the DLP policy configuration options.
    3. On mobile, the oversharing dialog can be either the default or a customized dialog:
      • Default oversharing dialog: Uses the same text as the policy tip (default or custom) and, when applicable, a noncustomizable set of justification options to override the policy.
      • Customized oversharing dialog: Allows a customized title, body, dynamic variables (for example, %%MatchedRecipientsList%%), and justification options.
      The dialog is therefore expected to present justification options, but the justification options themselves are not fully customizable on mobile in the default dialog. The documentation does not state that the full desktop-style justification dialog (with all the same layout/controls) is replicated exactly on mobile.
    4. Known limitations and considerations for Outlook mobile:
      • Outlook for Android and iOS currently do not support DLP Wait‑to‑Send (wait on send dialog support for oversharing). That capability is available for Outlook for Microsoft 365 on Windows but “doesn't yet support DLP Wait‑to‑Send” on mobile.
      • The oversharing dialog must be enabled in the DLP rule; user overrides are only available when “Notify users in Office 365 services with a policy tip” is enabled and the rule is configured with a block + override action (for example, Notify + Block + AllowOverride + With justification). If NotifyAllowOverride is configured but BlockAccess is not set to true (or BlockAccessScope is not appropriate), the policy tip appears but users do not see an override option.
      • Policy tips and overrides are rule‑driven: if content matches multiple rules, only the policy tip from the most restrictive rule with highest priority is shown. Overriding that rule also overrides other matched rules.
      • User overrides are not available for on‑premises repositories.

    Given that the justification prompt works on Outlook desktop and Outlook on the web but not on Outlook for Android, verify specifically that:

    1. The DLP rule is configured with Notify + Block + AllowOverride and Require justification (for example, Notify + Block + AllowOverride + With justification) and that BlockAccess is true with an appropriate BlockAccessScope.
    2. The policy is in the Turn it on state (not only simulation) for email workloads.
    3. The oversharing dialog feature is enabled for Outlook mobile in the relevant DLP rule (using the Purview portal configuration for policy tips and oversharing dialogs, not Exchange-only mail flow rules).

    If all of the above are in place and the mobile client still does not show the override/justification dialog, this is likely due to client/version rollout or service-side limitations not detailed in the provided documentation and would require a support case for confirmation.

    References:

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