The answer is that the SAS token has expired and the application is not regenerating it before it expires. This is the most likely cause of intermittent AuthorizationFailure errors because a shared access signature token is issued with a finite lifetime; once that window closes, any request using the stale token is rejected by Azure Storage. The intermittent nature of the failure directly reflects the token’s validity period—uploads succeed while the token is still active, then fail after it expires until the application refreshes it. On the Microsoft Azure Developer Associate AZ-204 exam, this scenario tests your understanding of SAS token lifecycle management and the common trap of generating a token once at application startup without implementing a refresh mechanism. A key memory tip: think of a SAS token like a parking meter—it works perfectly until the time runs out, and your app must “feed the meter” by generating a new token before the old one expires.
AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. 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.
You have a web application that writes user-uploaded images to Azure Blob Storage. The application uses a shared access signature (SAS) token with read and write permissions. Users report that sometimes they receive 'AuthorizationFailure' errors when uploading images, but the issue is intermittent. 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 blob container has a soft-delete policy that is preventing uploads
Why wrong: Soft-delete does not block uploads; it only affects deletion operations.
B
The storage account firewall is blocking requests from the web application's IP
Why wrong: Firewall rules would cause consistent failures, not intermittent.
C
The SAS token has expired and the application is not regenerating it before it expires
Intermittent failures are a classic symptom of an expiring SAS token. The application should refresh the token or use a stored access policy with longer validity.
D
The SAS token was generated with an incorrect IP range restriction
Why wrong: IP restrictions would cause consistent failures, not intermittent ones.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The SAS token has expired and the application is not regenerating it before it expires
Option C is correct because SAS tokens have a defined expiration time. If the application does not regenerate the token before it expires, uploads will intermittently fail with 'AuthorizationFailure' errors. The intermittent nature is explained by the token being valid for some requests and expired for others, depending on when the token was last refreshed.
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 has a soft-delete policy that is preventing uploads
Why it's wrong here
Soft-delete does not block uploads; it only affects deletion operations.
✗
The storage account firewall is blocking requests from the web application's IP
Why it's wrong here
Firewall rules would cause consistent failures, not intermittent.
✓
The SAS token has expired and the application is not regenerating it before it expires
Why this is correct
Intermittent failures are a classic symptom of an expiring SAS token. The application should refresh the token or use a stored access policy with longer validity.
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 SAS token was generated with an incorrect IP range restriction
Why it's wrong here
IP restrictions would cause consistent failures, not intermittent ones.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse intermittent failures with network or firewall issues, but the key clue is 'intermittent' — which points to a time-based expiry rather than a static configuration problem like IP restrictions or soft-delete policies.
Detailed technical explanation
How to think about this question
SAS tokens are generated with a signed expiry field (se) in the token string. When the token expires, Azure Blob Storage returns HTTP 403 (AuthorizationFailure) for any operation using that token. The application must implement a token refresh mechanism, typically by checking the token's expiry time and generating a new one before it expires, or by using a shorter-lived token with automatic renewal via Azure SDK retry policies.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The SAS token has expired and the application is not regenerating it before it expires — Option C is correct because SAS tokens have a defined expiration time. If the application does not regenerate the token before it expires, uploads will intermittently fail with 'AuthorizationFailure' errors. The intermittent nature is explained by the token being valid for some requests and expired for others, depending on when the token was last refreshed.
What should I do if I get this AZ-204 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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