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The Report Message and Report Phishing add-ins work with most Microsoft 365 subscriptions and the following products:
- Outlook on the web
- Outlook 2013 SP1 or later
- Outlook 2016 for Mac
- Outlook included with Microsoft 365 apps for Enterprise
- Outlook for iOS and Android
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Currently, reporting messages in shared mailboxes or other mailboxes by a delegate using the add-ins isn't supported. Messages aren't sent to the reporting mailbox or to Microsoft. Built-in reporting in Outlook on the web in shared mailboxes or other mailboxes by a delegate is supported. Messages are sent to the reporting mailbox or to Microsoft.
https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/submissions-users-report-message-add-in-configure?view=o365-worldwide#get-the-report-message-add-in-for-yourself