The answer is that the IAM policy used by Terraform does not include the `s3:ListBucket` permission on the S3 bucket. This is the most likely cause because Terraform’s S3 backend requires the `s3:ListBucket` action to enumerate workspaces and objects within the bucket before it can read or write state files; without it, the API call to list objects returns an AccessDenied error, even if the user has permissions for individual object operations like `s3:GetObject` or `s3:PutObject`. On the HashiCorp Terraform Associate TF-003 exam, this question tests your understanding of the specific IAM permissions required for an S3 backend—a common trap is assuming that being able to list the bucket via the AWS CLI (which may use a different profile or role) means Terraform has the same permissions. Remember the memory tip: “List before Lock”—Terraform must first list the bucket’s contents before it can acquire a state lock or access any state file, so missing `s3:ListBucket` is the classic culprit for an AccessDenied on `terraform plan`.
TF-003 Use Terraform outside the core workflow Practice Question
This TF-003 practice question tests your understanding of use terraform outside the core workflow. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 DevOps engineer is responsible for maintaining Terraform configurations that manage resources in AWS. The team uses an S3 backend with DynamoDB state locking. The engineer notices that a recent 'terraform plan' command failed with the following error: 'Error: Failed to get existing workspaces: AccessDenied: Access Denied'. Other team members are able to run plans successfully from their machines. The engineer has verified that they have the correct AWS credentials configured via environment variables and that they can list the contents of the S3 bucket using the AWS CLI. The DynamoDB table exists and the engineer can describe it. What is the most likely cause of this error?
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 IAM policy used by Terraform does not include 's3:ListBucket' permission on the S3 bucket.
Option B is correct because the error indicates that the IAM user or role does not have permission to call the S3 ListObjects operation on the bucket, even though they can access the bucket directly via CLI (perhaps due to different IAM entity or CLI using different credentials). Option A is wrong because the error message does not mention state lock. Option C is wrong because the engineer can describe the DynamoDB table. Option D is wrong because the configuration is consistent with other team members.
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 DynamoDB table does not have the correct primary key schema.
Why it's wrong here
Schema issues cause lock errors, not AccessDenied.
✓
The IAM policy used by Terraform does not include 's3:ListBucket' permission on the S3 bucket.
Why this is correct
The 'get existing workspaces' operation lists objects in the bucket path.
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 Terraform configuration has a syntax error in the backend block.
Why it's wrong here
Syntax errors cause parse errors, not AccessDenied.
✗
The DynamoDB table is not in the same region as the S3 bucket.
Why it's wrong here
Region mismatch would cause a different error, not AccessDenied.
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 practitioner preparing for the TF-003 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which TF-003 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.
Use Terraform outside the core workflow — This question tests Use Terraform outside the core workflow — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IAM policy used by Terraform does not include 's3:ListBucket' permission on the S3 bucket. — Option B is correct because the error indicates that the IAM user or role does not have permission to call the S3 ListObjects operation on the bucket, even though they can access the bucket directly via CLI (perhaps due to different IAM entity or CLI using different credentials). Option A is wrong because the error message does not mention state lock. Option C is wrong because the engineer can describe the DynamoDB table. Option D is wrong because the configuration is consistent with other team members.
What should I do if I get this TF-003 question wrong?
Identify which TF-003 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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