This CCSP practice question tests your understanding of cloud application security. 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 fintech startup deploys a customer-facing web application on Azure App Service. The application uses OAuth 2.0 with Azure AD for authentication. Recently, users report being logged out unexpectedly during active sessions. Security logs show multiple token refresh attempts failing with 'invalid_grant' errors. The application uses a standard library for token management. What is the most likely cause and recommended action?
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 access token and refresh token lifetimes are misconfigured; align token lifetimes
The 'invalid_grant' error during token refresh typically indicates that the refresh token has expired or been revoked. In Azure AD, refresh token lifetimes are configurable and, if set too short or misaligned with the access token lifetime, users will be logged out unexpectedly when the refresh token expires before a new access token is requested. The standard library correctly handles the OAuth 2.0 flow, but the token lifetime configuration in the Azure AD app registration is the root cause.
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 Azure AD API is throttling requests; implement exponential backoff
Why it's wrong here
Throttling would return HTTP 429, not 'invalid_grant'.
✓
The access token and refresh token lifetimes are misconfigured; align token lifetimes
Why this is correct
If the access token outlives the refresh token, refresh attempts fail.
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 authorization code was reused; implement PKCE to prevent reuse
Why it's wrong here
Authorization code reuse is prevented by the OAuth server; the error is not typical.
✗
The user consent was revoked; advise users to re-consent
Why it's wrong here
Revoked consent would show 'consent_required' errors, not 'invalid_grant'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between token refresh errors (invalid_grant) and other OAuth 2.0 errors (e.g., throttling, consent issues), and candidates mistakenly attribute the problem to PKCE or throttling without recognizing that token lifetime misconfiguration is the most common cause of unexpected logouts in Azure AD.
Trap categories for this question
Command / output trap
Revoked consent would show 'consent_required' errors, not 'invalid_grant'.
Detailed technical explanation
How to think about this question
Azure AD issues refresh tokens with a default lifetime of 90 days for single-page apps and 14 days for native apps, but these can be customized via the 'accessTokenLifetime' and 'refreshTokenLifetime' policies in the Microsoft identity platform. The 'invalid_grant' error is defined in RFC 6749 Section 5.2 and occurs when the refresh token is expired, revoked, or invalid; in this case, the refresh token lifetime is likely shorter than the user's session duration, causing forced re-authentication. A real-world scenario is when an organization sets a 1-hour refresh token lifetime for security but the application expects sessions to last 8 hours, leading to frequent logout complaints.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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.
Cloud Application Security — This question tests Cloud Application Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The access token and refresh token lifetimes are misconfigured; align token lifetimes — The 'invalid_grant' error during token refresh typically indicates that the refresh token has expired or been revoked. In Azure AD, refresh token lifetimes are configurable and, if set too short or misaligned with the access token lifetime, users will be logged out unexpectedly when the refresh token expires before a new access token is requested. The standard library correctly handles the OAuth 2.0 flow, but the token lifetime configuration in the Azure AD app registration is the root cause.
What should I do if I get this CCSP 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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Question Discussion
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