Account Security Problems

Is DecomDevilFish in Microsoft Entra Safe? Enterprise Application Guide

Huma Ashraf Ch Oct 7, 2026 871 views

Question details

A Microsoft Entra administrator needs to verify the legitimacy and safety of an enterprise application named DecomDevilFish and understand why it cannot be deleted.

Understanding the DecomDevilFish Enterprise Application in Microsoft Entra

Product: Microsoft Entra
Device & OS: not provided
Scenario: Reviewing enterprise applications in a Microsoft 365 tenant for security auditing and management.
Observed behavior: An undocumented application named DecomDevilFish is present in the tenant and lacks a standard deletion option.

Before you start

Ensure you have Global Administrator or Privileged Role Administrator access in Microsoft Entra to review service principals and enterprise applications.

Solution 1Recommended

Review Application Details in Microsoft Entra

Verify the service principal properties to understand its origin as a backend application.

DecomDevilFish is typically a backend service application present across multiple Microsoft 365 tenants. Because it is installed server-side by Microsoft, standard deletion options may be intentionally disabled.

Access the Admin Center

Navigate to Enterprise Applications

Go to Identity > Applications > Enterprise applications in the left-hand navigation menu.

Search for the Application

Search for "DecomDevilFish" to view its specific properties, permissions, and service principal details.

Verify with PowerShell

Alternatively, open PowerShell, connect to your tenant, and run the command Get-MsolServicePrincipal to review the backend service principal details.

Review Application Details in Microsoft Entra

Community Support: If you require official tenant-specific confirmation, consider posting your query directly in the Microsoft Entra ID Q&A forum.

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Frequently Asked Questions

Why can't I delete DecomDevilFish from Microsoft Entra?

First-party or backend server-side applications managed by Microsoft often have their deletion options disabled by design to prevent accidental disruption of tenant services.

Does DecomDevilFish pose a security risk to my tenant?

Generally, it is a legitimate backend application present in many Microsoft 365 tenants. However, you should verify its service principal details in your Entra portal to ensure it matches standard backend app profiles.

How do I use PowerShell to check this application?

You can connect to Microsoft 365 via PowerShell and run the Get-MsolServicePrincipal command to list and review the properties of all service principals, including DecomDevilFish.

Where can I get official confirmation about undocumented Entra applications?

The best place to get tenant-specific confirmation for undocumented enterprise applications is the official Microsoft Entra ID Q&A forum, where Microsoft moderators and engineers can investigate your tenant.

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