Quick Answer
The answer is that the IAM role trust policy was not updated after credential rotation. This is the most likely cause because when AWS IAM role credentials are rotated, Vault uses those specific access key and secret key to call the AWS STS API for authentication. If the trust policy attached to the IAM role still references the old credentials, the trust relationship between Vault and AWS breaks, causing Vault’s AWS auth method to reject login requests and log a ‘permission denied’ error. On the HashiCorp Vault Associate VA-003 exam, this scenario tests your understanding of how Vault’s AWS IAM auth method relies on a static trust policy to validate credentials—a common trap is assuming rotation only affects the user, not the policy itself. Remember the memory tip: “Rotate the key, update the trust—or Vault will bust.”
This VA-003 practice question tests your understanding of assess vault tokens. 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.
An organization uses Vault with AWS IAM auth. After rotating the AWS IAM role credentials, users are unable to authenticate with Vault. The Vault audit logs show 'permission denied' for the AWS auth method. 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.
The IAM role trust policy was not updated after credential rotation
The trust policy must allow the new credentials to assume the role.
The Vault token TTL expired
Why wrong: Token TTL does not affect AWS IAM authentication.
The client token used for AWS auth is revoked
Why wrong: AWS IAM auth does not use a client token; it uses the IAM role.
The AWS secret engine is disabled
Why wrong: The secret engine is separate from the auth method.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The IAM role trust policy was not updated after credential rotation
When AWS IAM role credentials are rotated, the trust policy attached to the IAM role must be updated to reflect the new credentials (access key and secret key) that Vault uses to call the AWS STS API. If the trust policy still references the old credentials, Vault's AWS auth method cannot validate the login request, resulting in a 'permission denied' error in the audit logs. This is the most likely cause because the rotation directly breaks the trust relationship between Vault and AWS.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The IAM role trust policy was not updated after credential rotation
Why this is correct
The trust policy must allow the new credentials to assume the 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 Vault token TTL expired
Why it's wrong here
Token TTL does not affect AWS IAM authentication.
The client token used for AWS auth is revoked
Why it's wrong here
AWS IAM auth does not use a client token; it uses the IAM role.
The AWS secret engine is disabled
Why it's wrong here
The secret engine is separate from the auth method.
Common exam traps
HashiCorp often tests the misconception that credential rotation only affects the client's AWS credentials, not the trust relationship between Vault and AWS, leading candidates to incorrectly choose token-related options like B or C.
Detailed technical explanation
Under the hood, Vault's AWS auth method uses the configured IAM role's access key and secret key to call the AWS STS AssumeRole or GetCallerIdentity API to verify the client's identity. After credential rotation, the old keys are invalid, so the STS call fails with an 'AccessDenied' exception, which Vault translates into a 'permission denied' audit log entry. A real-world scenario is when automated credential rotation scripts update the IAM user's keys but forget to update the corresponding Vault configuration (e.g., via `vault write auth/aws/config/role/<role>`), causing an outage until the trust policy is manually refreshed.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the VA-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
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
Assess Vault tokens — This question tests Assess Vault tokens — Read the scenario before looking for a memorised answer..
The correct answer is: The IAM role trust policy was not updated after credential rotation — When AWS IAM role credentials are rotated, the trust policy attached to the IAM role must be updated to reflect the new credentials (access key and secret key) that Vault uses to call the AWS STS API. If the trust policy still references the old credentials, Vault's AWS auth method cannot validate the login request, resulting in a 'permission denied' error in the audit logs. This is the most likely cause because the rotation directly breaks the trust relationship between Vault and AWS.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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