The answer is that the user is not passing the MFA serial number and token code in the assume-role API call. Even though the user has MFA enabled and is passing the MFA token, the IAM role trust policy condition explicitly checks for the presence of both `aws:MultiFactorAuthSerialNumber` and `aws:MultiFactorAuthTokenCode` parameters. Without these specific parameters included in the `sts:AssumeRole` API call, the condition evaluates to false, causing the AccessDenied error. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding that simply having MFA enabled is insufficient; the calling principal must explicitly supply the serial number and token code in the API request. A common trap is assuming the `aws:MultiFactorAuthPresent` key alone satisfies the policy, but the additional `aws:MultiFactorAuthAge` condition here requires the full MFA context. Remember the mnemonic: "MFA serial and token—without them, your trust is broken."
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Refer to the exhibit. An IAM role trust policy is shown. A user from account 123456789012 tries to assume this role but receives an 'AccessDenied' error. The user has MFA enabled and is passing the MFA token. What is the MOST likely reason for the failure?
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 is not passing the MFA serial number and token code in the assume-role API call.
Option C is correct because the IAM role trust policy includes a condition that checks for the presence of both `aws:MultiFactorAuthPresent` and `aws:MultiFactorAuthAge`. Even though the user has MFA enabled and is passing the MFA token, the `aws:MultiFactorAuthSerialNumber` and `aws:MultiFactorAuthTokenCode` parameters must be explicitly included in the `sts:AssumeRole` API call. Without these, the condition evaluates to false, resulting in an 'AccessDenied' error.
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 condition uses 'BoolIfExists' instead of 'Bool' which causes the policy to fail when the key is present.
Why it's wrong here
BoolIfExists works correctly; it returns true if the key exists and is true.
✗
The role requires MFA, but the user's MFA device is not configured correctly.
Why it's wrong here
The question states MFA is enabled and token is passed.
✓
The user is not passing the MFA serial number and token code in the assume-role API call.
Why this is correct
Even if MFA is enabled, the user must provide serial number and token code in the STS AssumeRole call.
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 principal is set to the root account, which does not allow IAM users to assume the role.
Why it's wrong here
The root account principal allows any IAM user from that account.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume that simply having MFA enabled and passing the token in the session is sufficient, but the `sts:AssumeRole` API call requires the MFA serial number and token code to be explicitly provided as parameters, which is a common oversight in programmatic role assumption scenarios.
Detailed technical explanation
How to think about this question
When using the AWS CLI or SDK to assume a role with MFA, you must include the `--serial-number` (MFA device ARN) and `--token-code` parameters in the `sts:AssumeRole` call. The trust policy's condition `aws:MultiFactorAuthPresent` checks for the presence of MFA authentication in the session, but this condition alone does not enforce that the MFA serial number and token are passed; the `aws:MultiFactorAuthAge` condition further requires that the MFA authentication is recent. In practice, if a user assumes a role via the AWS Management Console, the MFA token is automatically passed, but programmatic access requires explicit inclusion of these parameters.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The user is not passing the MFA serial number and token code in the assume-role API call. — Option C is correct because the IAM role trust policy includes a condition that checks for the presence of both `aws:MultiFactorAuthPresent` and `aws:MultiFactorAuthAge`. Even though the user has MFA enabled and is passing the MFA token, the `aws:MultiFactorAuthSerialNumber` and `aws:MultiFactorAuthTokenCode` parameters must be explicitly included in the `sts:AssumeRole` API call. Without these, the condition evaluates to false, resulting in an 'AccessDenied' error.
What should I do if I get this SAP-C02 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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