← DOP-C02·Amazon Web Services

Question 1,074 of 1,750

Configuration Management and IaC →mediumMultiple ChoiceObjective-mapped

CloudFormation StackSets IAM Trust Error Troubleshooting

This DOP-C02 practice question tests your understanding of configuration management and iac. 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 company uses AWS CloudFormation to deploy a web application across multiple AWS accounts using StackSets. The DevOps team notices that stack instance updates are failing in some accounts with the error: 'Insufficient IAM permissions to perform the action'. The team has already verified that the StackSet IAM role has the necessary permissions. What is the most likely cause of this issue?

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.

A
The target accounts have reached the limit of 200 stacks per region.
Why wrong: The error message specifically indicates an IAM permissions issue, not a limit.
B
The target accounts do not have the necessary trust policy to allow the StackSet IAM role to assume the execution role.
StackSets require a trust relationship between the StackSet IAM role and the execution role in target accounts.
C
AWS Organizations has a service control policy (SCP) that denies the required action, but the StackSet IAM role has full admin permissions.
Why wrong: SCPs can override IAM permissions, but the error is about trust, not SCP.
D
The StackSet name contains invalid characters that are not allowed in some accounts.
Why wrong: StackSet naming rules are consistent across accounts.

Full breakdown with real-world context →

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 target accounts do not have the necessary trust policy to allow the StackSet IAM role to assume the execution role.

Option B is correct because StackSets require a trust relationship between the StackSet IAM role (in the management account) and an execution role in each target account. Even if the StackSet IAM role has full permissions, the target accounts must have a trust policy that allows the StackSet IAM role to assume the execution role. Without this trust policy, the assumption fails, resulting in the 'Insufficient IAM permissions' 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 target accounts have reached the limit of 200 stacks per region.
Why it's wrong here
The error message specifically indicates an IAM permissions issue, not a limit.
✓
The target accounts do not have the necessary trust policy to allow the StackSet IAM role to assume the execution role.
Why this is correct
StackSets require a trust relationship between the StackSet IAM role and the execution role in target accounts.
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.
✗
AWS Organizations has a service control policy (SCP) that denies the required action, but the StackSet IAM role has full admin permissions.
Why it's wrong here
SCPs can override IAM permissions, but the error is about trust, not SCP.
✗
The StackSet name contains invalid characters that are not allowed in some accounts.
Why it's wrong here
StackSet naming rules are consistent across accounts.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume the error is due to missing permissions on the StackSet IAM role itself, but the DOP-C02 exam tests the understanding that StackSets require a trust chain where the target account's execution role must explicitly trust the management account's StackSet IAM role.

Detailed technical explanation

How to think about this question

Under the hood, StackSets use a two-role model: the StackSet IAM role in the management account performs sts:AssumeRole to an execution role in each target account. The execution role's trust policy must explicitly list the StackSet IAM role's ARN as a trusted entity. If this trust policy is missing or misconfigured, the AWS STS AssumeRole API call fails with an access denied error, which surfaces as 'Insufficient IAM permissions' in CloudFormation. A real-world scenario is when target accounts are created via AWS Organizations but the required execution role (e.g., AWSCloudFormationStackSetExecutionRole) is not deployed or its trust policy is not updated.

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.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The target accounts do not have the necessary trust policy to allow the StackSet IAM role to assume the execution role. — Option B is correct because StackSets require a trust relationship between the StackSet IAM role (in the management account) and an execution role in each target account. Even if the StackSet IAM role has full permissions, the target accounts must have a trust policy that allows the StackSet IAM role to assume the execution role. Without this trust policy, the assumption fails, resulting in the 'Insufficient IAM permissions' error.

What should I do if I get this DOP-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.

About these practice questions

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Same concept, more angles

1 more ways this is tested on DOP-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company uses AWS CloudFormation StackSets to deploy a VPC across multiple AWS accounts in AWS Organizations. The StackSet is created with self-managed permissions. The deployment fails in some accounts with the error: 'Insufficient IAM permissions to create resources'. What is the most likely cause of this failure?

hard

A.The StackSet does not support deploying to more than one account
✓ B.The execution IAM role is not created in the target accounts
C.The administrator account does not have a service-linked role for StackSets
D.The target accounts have reached their resource service quotas

Why B: With self-managed permissions in AWS CloudFormation StackSets, the administrator account does not automatically create the necessary IAM roles in target accounts. The execution IAM role must be manually created in each target account to grant StackSets the permissions required to create resources. The error 'Insufficient IAM permissions to create resources' directly indicates that this execution role is missing or lacks the required policies.

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