The answer is that the search service's managed identity lacks the 'Storage Blob Data Reader' role. This is correct because Azure AI Search indexers require explicit RBAC permissions to read blob content from Azure Blob Storage; the 'AccessDenied' error specifically means the search service's identity—whether system-assigned or user-assigned—has not been granted the necessary data-plane role on the storage account. On the Microsoft Azure AI Engineer Associate AI-102 exam, this scenario tests your understanding of managed identity authentication versus key-based access, and it often appears as a trap where candidates mistakenly look at network restrictions or indexer configuration instead of role assignments. Remember that for indexers to read blobs, the identity must have the 'Storage Blob Data Reader' role at the storage account scope, not just contributor or owner. A helpful memory tip: "Reader reads blobs, Contributor controls the account—don't confuse the two."
AI-102 Plan and manage an Azure AI solution Practice Question
This AI-102 practice question tests your understanding of plan and manage an azure ai solution. 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 Azure AI Search indexer is failing to index documents from an Azure Blob Storage container. The error message shows 'AccessDenied'. 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 search service's managed identity lacks 'Storage Blob Data Reader' role.
The 'AccessDenied' error indicates that the Azure AI Search service lacks the necessary permissions to read data from the Azure Blob Storage container. The most likely fix is to assign the 'Storage Blob Data Reader' role to the search service's system-assigned managed identity, which grants read access to blob containers and their contents.
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 blob container name is misspelled in the datasource.
Why it's wrong here
Would cause a 'ContainerNotFound' error, not AccessDenied.
✗
The indexer execution interval is set too high.
Why it's wrong here
Would cause infrequent indexing, not access errors.
✓
The search service's managed identity lacks 'Storage Blob Data Reader' role.
Why this is correct
AccessDenied indicates missing permissions to read blobs.
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 index schema does not match the blob metadata.
Why it's wrong here
Would cause field mapping errors, not AccessDenied.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the distinction between authentication (who you are) and authorization (what you can do), leading candidates to confuse a missing role assignment with a configuration error like a misspelled container name or schema mismatch.
Detailed technical explanation
How to think about this question
Under the hood, Azure AI Search uses either a managed identity or connection string to authenticate to Azure Blob Storage. When using a managed identity, the search service must be explicitly granted the 'Storage Blob Data Reader' role at the storage account scope via Azure RBAC; without this role, any attempt to list or read blobs returns HTTP 403 (AccessDenied). This is distinct from shared key authentication, which uses a connection string and does not require RBAC roles.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Plan and manage an Azure AI solution — This question tests Plan and manage an Azure AI solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The search service's managed identity lacks 'Storage Blob Data Reader' role. — The 'AccessDenied' error indicates that the Azure AI Search service lacks the necessary permissions to read data from the Azure Blob Storage container. The most likely fix is to assign the 'Storage Blob Data Reader' role to the search service's system-assigned managed identity, which grants read access to blob containers and their contents.
What should I do if I get this AI-102 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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