The answer is that the application is using a SQL login instead of a Microsoft Entra token or integrated authentication. Error 18456 state 10 specifically means the login was not recognized by SQL Server, which occurs because a contained database user for Microsoft Entra authentication cannot be validated with a traditional SQL username and password—it requires an access token from the Entra ID endpoint or Windows integrated authentication. On the DP-300 exam, this scenario tests your understanding of how Azure SQL Managed Instance enforces authentication flows, often appearing as a trap where candidates confuse contained database users with SQL logins. Remember that state 10 always points to an authentication mismatch, not a permission or connectivity issue. A helpful memory tip: “State 10 says ‘Who are you?’—if you’re using Entra, bring a token, not a password.”
DP-300 Implement a secure environment Practice Question
This DP-300 practice question tests your understanding of implement a secure environment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Your company uses Azure SQL Managed Instance and requires that all connections from client applications use Microsoft Entra authentication with multi-factor authentication (MFA). You configure Azure SQL Managed Instance to support Microsoft Entra authentication and create a contained database user for the application. However, when the application attempts to connect, it receives error '18456, state 10' indicating that the login is not recognized. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application is using a SQL login instead of a Microsoft Entra token or integrated authentication.
Error 18456, state 10 specifically indicates that the login was not recognized by SQL Server. Since the application is configured to use a contained database user with Microsoft Entra authentication, the most likely cause is that the application is attempting to connect using a SQL login (username/password) rather than presenting a Microsoft Entra access token or using integrated authentication. Contained database users require authentication through the Microsoft Entra ID token flow, not SQL Server authentication.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The contained database user is not mapped to a server-level login.
Why it's wrong here
Contained users are not required to have server-level logins.
✗
The client IP address is not allowed by the server-level firewall rule.
Why it's wrong here
Firewall rules control network access, not authentication.
✓
The application is using a SQL login instead of a Microsoft Entra token or integrated authentication.
Why this is correct
The application must use Microsoft Entra authentication method; error 18456 state 10 indicates a SQL login attempt.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The server principal (server admin) is not a Microsoft Entra account.
Why it's wrong here
The server admin can be a SQL login; contained users are independent.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a contained database user must be mapped to a server-level login (Option A), but in Azure SQL Managed Instance, contained users are independent and authenticate directly via Microsoft Entra tokens, making the mapping misconception the primary distractor.
Detailed technical explanation
How to think about this question
When using Microsoft Entra authentication with contained database users, the client must acquire an access token from Microsoft Entra ID (via OAuth 2.0) and pass it in the connection string using the 'Authentication=Active Directory Default' or 'Authentication=Active Directory Integrated' parameter. The token is validated by Azure SQL Managed Instance against the Microsoft Entra tenant, and the contained user's SID is derived from the token's object ID. If the application sends a SQL login (username/password) instead, the server attempts SQL Server authentication, which fails because no SQL login exists for that user.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
Implement a secure environment — This question tests Implement a secure environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The application is using a SQL login instead of a Microsoft Entra token or integrated authentication. — Error 18456, state 10 specifically indicates that the login was not recognized by SQL Server. Since the application is configured to use a contained database user with Microsoft Entra authentication, the most likely cause is that the application is attempting to connect using a SQL login (username/password) rather than presenting a Microsoft Entra access token or using integrated authentication. Contained database users require authentication through the Microsoft Entra ID token flow, not SQL Server authentication.
What should I do if I get this DP-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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