“Not Authorized to Perform” in AWS: How to Find the Missing Permission
Interpret AWS not-authorized messages, identify the action and resource, and check the policy layers that can deny a request.
The phrase “not authorized to perform” identifies an authorization failure, but it does not always mean one simple IAM statement is missing. The action, resource, principal, and policy context determine what to inspect next.
Parse the message into four parts
Find the principal making the request, the action it attempted, the resource involved, and any “because” clause. Keep the original text intact in your internal ticket, but remove credentials and sensitive identifiers before sharing it outside your organization.
Check the correct principal
Console sessions can use an IAM user, assumed role, federated identity, or IAM Identity Center session. Verify the active account and role before editing policies. It is easy to update a policy attached to the wrong principal.
Inspect all applicable policy layers
Review identity-based and resource-based policies, explicit denies, permissions boundaries, session policies, service control policies, resource control policies, and role trust relationships as applicable. The authorization engine evaluates the combined context, not one policy in isolation.
Use least privilege for the correction
Determine the exact action and resource ARN needed. Add the narrowest permission consistent with the task and organizational standards, including required conditions. Do not replace a precise diagnosis with broad administrator access.
Retest and keep an audit trail
Retry the original action and review CloudTrail events if available. Record which policy layer was responsible and why the final change is sufficient. If the message identifies an organization-managed policy, contact the administrator who owns it.
Frequently asked questions
Can an Allow policy be overridden?
Yes. An applicable explicit Deny or a restrictive policy layer can prevent access even when another policy contains an Allow.
What if the message does not name a policy?
Review the applicable policy layers systematically and use available authorization context, CloudTrail, and administrator assistance.
Official documentation and further reading
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