The answer is that the user’s permissions policy does not include sts:AssumeRole for the specific role ARN. Even when the role’s trust policy correctly allows the user’s account to assume it, the IAM user must also have an identity-based policy explicitly granting sts:AssumeRole action on that exact role resource. Without this, the cross-account role assumption fails with an access denied error at the API call itself, regardless of what the trust policy permits. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding that both the trust policy (on the role) and the permissions policy (on the user) must align—a common trap is assuming the trust policy alone is sufficient. Remember the two-way gate: the trust policy opens the door from the target account, but the user’s policy must provide the key to walk through. A handy mnemonic is “User permits the action, role trusts the account.”
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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 SysOps administrator is troubleshooting an issue where an IAM user cannot assume a role in another AWS account. The trust policy of the role allows the user's account to assume the role, and the user has a permissions policy that allows sts:AssumeRole. However, the user still gets an access denied error. 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 user's permissions policy does not include sts:AssumeRole for the specific role ARN
Option C is correct because even if the trust policy allows the account, the role's permissions policy must grant the user the necessary actions. In this case, the role's permissions policy might not include the required permissions for the services the user is trying to use after assuming the role. However, the question is about the error being access denied at the AssumeRole call itself. That would be due to the trust policy or the user's permissions. Option A is incorrect because MFA is not mentioned. Option B is incorrect because the role's trust policy allows the account. Option D is incorrect because external ID is optional.
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 trust policy specifies the user's ARN instead of the account ARN
Why it's wrong here
Trust policy can specify account or user; both work.
✓
The user's permissions policy does not include sts:AssumeRole for the specific role ARN
Why this is correct
The user must have an IAM policy that allows sts:AssumeRole on the target role.
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 role requires MFA, but the user does not have MFA configured
The role's permissions policy does not include an external ID
Why it's wrong here
External ID is only required for third-party access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The user's permissions policy does not include sts:AssumeRole for the specific role ARN — Option C is correct because even if the trust policy allows the account, the role's permissions policy must grant the user the necessary actions. In this case, the role's permissions policy might not include the required permissions for the services the user is trying to use after assuming the role. However, the question is about the error being access denied at the AssumeRole call itself. That would be due to the trust policy or the user's permissions. Option A is incorrect because MFA is not mentioned. Option B is incorrect because the role's trust policy allows the account. Option D is incorrect because external ID is optional.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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