The correct answer is that the service principal secret or certificate used for authentication has expired. This is the most likely cause because when a Power BI dataset uses DirectQuery to an Azure Analysis Services model configured with service principal authentication, the connection relies on a valid secret or certificate to authenticate against Microsoft Entra ID. If those credentials expire, the service principal can no longer prove its identity, resulting in the "credentials provided are invalid" error. On the PL-300 exam, this question tests your understanding of service principal lifecycle management and how expired credentials manifest as authentication failures rather than permission issues. A common trap is confusing this with role-based access control or import mode refresh problems, but DirectQuery connections fail immediately if the service principal’s authentication token cannot be generated. Remember the memory tip: "Expired secret? DirectQuery’s dead."
PL-300 Manage and secure Power BI Practice Question
This PL-300 practice question tests your understanding of manage and secure power bi. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 organization uses Microsoft Entra ID for identity management. You have a Power BI dataset that uses DirectQuery to an Azure Analysis Services (AAS) model. The AAS model is configured to use service principal authentication. Users report that when they open a report connected to this dataset, they see an error: 'Cannot connect to the data source. The credentials provided are invalid.' 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 service principal secret or certificate used for authentication has expired.
Option A is correct. The service principal credentials may have expired or been revoked. Option B is wrong because the dataset uses DirectQuery, not Import mode. Option C is wrong because RLS is configured on the Power BI dataset, not on AAS. Option D is wrong because the service principal is configured for authentication, but the error indicates invalid credentials, not lack of permissions.
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 service principal secret or certificate used for authentication has expired.
Why this is correct
Expired credentials cause authentication failures.
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.
✗
Row-level security (RLS) on the AAS model is not configured correctly.
Why it's wrong here
RLS does not affect connectivity; it filters data after connection.
✗
The service principal does not have 'Read' permission on the AAS model.
Why it's wrong here
The error is about credentials, not permissions.
✗
The dataset is in Import mode and requires a scheduled refresh.
Why it's wrong here
The question states DirectQuery, so no refresh is needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
What to study next
Got this wrong? Here's your next step.
Identify which PL-300 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Manage and secure Power BI — This question tests Manage and secure Power BI — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The service principal secret or certificate used for authentication has expired. — Option A is correct. The service principal credentials may have expired or been revoked. Option B is wrong because the dataset uses DirectQuery, not Import mode. Option C is wrong because RLS is configured on the Power BI dataset, not on AAS. Option D is wrong because the service principal is configured for authentication, but the error indicates invalid credentials, not lack of permissions.
What should I do if I get this PL-300 question wrong?
Identify which PL-300 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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