Removing Report Junk / Phishing From Outlook via 365 Admin

To remove the Report Phishing and Report Junk buttons from all users in Outlook please find below settings,

• This is the native button in New Outlook and Outlook on the Web.
• To disable it:
1. Go to Microsoft 365 Defender portal: https://security.microsoft.com
2. Navigate: Settings → Email & collaboration → User reported settings
3. Under Report button settings, select: Use a non-Microsoft add-in button or Disable reporting.
Save changes

Report Message / Report Phishing Add-ins,

If these buttons are from Microsoft add-ins:

Go to Microsoft 365 Admin Center: https://admin.microsoft.com
Navigate:
Settings → Integrated apps
Locate Report Message or Report Phishing add-ins.
Click Remove app.

Note –You cannot selectively remove only “Report Phishing” while keeping “Report Junk

Please refer the below MS article for more information,

Transition from Report Message or the Report Phishing add-ins – Microsoft Defender for Office 365 | Microsoft Learn

User reported settings – Microsoft Defender for Office 365 | Microsoft Learn