MB-910 Describe Dynamics 365 Customer Insights Practice Question
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?
⚠ Common exam trap
A common mix-up: candidates 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.
Answer choices
Why each option matters
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.
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 connection string or SAS token is invalid or expired
Why this is correct
Invalid credentials lead to access denied.
- ✗
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.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This MB-910 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MB-910 exam.