How to Prevent Microsoft 365 Mark as Phishing from Creating False Actions

Microsoft 365's Mark as Phishing feature can cause false actions on your tests. To prevent this from happening, the junk email and phishing email reporting feature will need to be disabled. 

The below steps show you how to do this in Exchange Powershell:

1. Run the following command in Exchange PowerShell to locate the policy:

   Get-OwaMailboxPolicy | Format-Table Name,ReportJunkEmailEnabled

2. Set the ReportJunkEmailEnabled to false by running the below command:

   Set-OwaMailboxPolicy -Identity "OwaMailboxPolicy-Default"
    -ReportJunkEmailEnabled $false

3. Verify that the changes will work by running a simulated phishing campaign and clicking the Mark as Phishing option (shown below):