# Resolve Azure deny-assignment exclusions and inheritance before adding roles

> An All Principals deny can have explicit exclusions, and its child-scope behavior must be read with the blocked action.

- Canonical URL: https://update.dsesecurity.com/updates/dse-20260909-431-resolve-azure-deny-assignment-exclusions-and-inheritance-before-adding-roles/
- Publisher: Detection Systems & Engineering (DSE Security)
- Author: DSE Security Editorial Team
- Published: 2026-09-10T00:24:45+00:00
- Modified: 2026-09-10T02:04:57+00:00
- Last reviewed by DSE: 2026-09-09
- Resource type: Guide
- DSE priority: Information
- Topics: Cybersecurity, Networks & Infrastructure
- Reading time: 2 minutes

## What you need to know

An All Principals deny can have explicit exclusions, and its child-scope behavior must be read with the blocked action.

## Potentially affected

Azure access investigations involving service-managed deny assignments.

## DSE recommendation

Compare denied actions, included and excluded principals, and scope inheritance before requesting another role.

## Article

## Source facts

Azure deny assignments can block resource actions even when a role assignment grants them. The zero-GUID SystemDefined principal represents all directory principals, but ExcludePrincipals can exempt specified identities from that deny.

DoNotApplyToChildScopes controls whether the assignment applies below its own scope and defaults to false. Azure creates and manages deny assignments; users cannot directly create arbitrary deny assignments, although deployment-stack deny settings can cause Azure to create a stack-owned one. [Microsoft Learn](https://learn.microsoft.com/en-us/azure/role-based-access-control/deny-assignments).

## Applicability

Identify the failed action, resource scope, caller and owning Azure feature. Inspect actual assignment properties rather than interpreting All Principals as a complete statement of effective access.

## DSE recommendation

DSE recommends examining the deny’s action list, exclusions and inheritance together before proposing another allow-role grant. Compare a working principal with the failing principal without copying its privileges. If the deny is unintended, route the correction through the owner and supported configuration of the protecting service. Do not attempt to delete a service-managed protection directly just to clear an access error.

## Verification

In an approved test scope, compare expected behavior for an included principal, an excluded principal and relevant child resources. Preserve the assignment identifier and properties with the action results. Confirm that any authorized configuration change corrects the intended case without removing required protection elsewhere. An exclusion from one deny should not be represented as proof that every other access requirement is satisfied.

## Official references

[Microsoft Learn: List Azure deny assignments – Azure RBAC](https://learn.microsoft.com/en-us/azure/role-based-access-control/deny-assignments). Source retrieved September 9, 2026.

## Primary reference

- Name: List Azure deny assignments - Azure RBAC | Microsoft Learn
- Authority: Microsoft Learn
- URL: https://learn.microsoft.com/en-us/azure/role-based-access-control/deny-assignments
- Source publication date: Not stated by the source

## Citation and use

Preferred citation: “Resolve Azure deny-assignment exclusions and inheritance before adding roles,” DSE Security, https://update.dsesecurity.com/updates/dse-20260909-431-resolve-azure-deny-assignment-exclusions-and-inheritance-before-adding-roles/
Publishing principles: https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/
Usage and citation policy: https://update.dsesecurity.com/usage/
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