Quick Answer
The answer is an invalid or expired connection string or SAS token. This is the most likely cause because Dynamics 365 Customer Insights uses these credentials to authenticate and authorize access to your Azure Blob Storage; when the token or string is incorrect or has expired, the service cannot prove it has permission to read the CSV file, triggering the 'Access denied' error. On the MB-910 exam, this scenario tests your understanding of data ingestion prerequisites and common authentication failures, often appearing as a trap where candidates mistakenly blame the file format or size. A helpful memory tip is to think of the SAS token as a timed key—if it expires, the door stays locked, so always verify the token’s validity and expiration date first.
This MB-910 practice question tests your understanding of describe dynamics 365 customer insights. 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.
A Customer Insights administrator receives an error when trying to ingest a CSV file from Azure Blob Storage. The error message says 'Access denied'. 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.
The connection string or SAS token is invalid or expired
Invalid credentials lead to access denied.
The CSV format is incompatible
Why wrong: Format issues cause parsing errors, not access denied.
The CSV file is too large
Why wrong: File size would cause a different error (timeout or size limit).
The schema does not match the mapping
Why wrong: Schema mismatch errors occur during ingestion, not connection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The connection string or SAS token is invalid or expired
The 'Access denied' error when ingesting a CSV file from Azure Blob Storage into Dynamics 365 Customer Insights indicates that the service cannot authenticate to the storage resource. The most common cause is an invalid or expired connection string or Shared Access Signature (SAS) token, as these credentials are required for secure access to Azure Blob Storage. Without valid credentials, Customer Insights cannot read the file, regardless of its format, size, or schema.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The connection string or SAS token is invalid or expired
Why this is correct
Invalid credentials lead to access denied.
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 CSV format is incompatible
Why it's wrong here
Format issues cause parsing errors, not access denied.
The CSV file is too large
Why it's wrong here
File size would cause a different error (timeout or size limit).
The schema does not match the mapping
Why it's wrong here
Schema mismatch errors occur during ingestion, not connection.
Common exam traps
The trap here is that candidates may confuse an authentication error with data-related issues (format, size, schema) because they focus on the CSV file itself rather than the access mechanism to the storage location.
Detailed technical explanation
Azure Blob Storage uses either a storage account key (connection string) or a SAS token for authentication. A SAS token includes an expiry time and permissions scope; if the token has expired or lacks 'Read' and 'List' permissions for the container, Customer Insights will receive an HTTP 403 (Forbidden) response. The connection string must also be correctly formatted with the account name and key; any typo or regeneration of the key invalidates the existing string.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Describe Dynamics 365 Customer Insights — This question tests Describe Dynamics 365 Customer Insights — Read the scenario before looking for a memorised answer..
The correct answer is: The connection string or SAS token is invalid or expired — The 'Access denied' error when ingesting a CSV file from Azure Blob Storage into Dynamics 365 Customer Insights indicates that the service cannot authenticate to the storage resource. The most common cause is an invalid or expired connection string or Shared Access Signature (SAS) token, as these credentials are required for secure access to Azure Blob Storage. Without valid credentials, Customer Insights cannot read the file, regardless of its format, size, or schema.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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