Web Reference: To resolve this error, find the user credential location, verify that the credentials are valid, and then update or replace the credentials. In the following example use case, the error occurs from an Amazon Elastic Compute Cloud (Amazon EC2) instance because the credentials aren't valid. Jan 16, 2026 · By following these steps, you’ll resolve the InvalidClientTokenId (403) error and ensure smooth authentication between Terraform and AWS. Remember: authentication issues are almost always tied to credentials or configuration—systematic checks will get you back on track! Sep 10, 2019 · It turned out to be because the cloudformation stack I was uploading was creating an IAM role, and AWS requires you use MFA in order to create IAM roles. So adding MFA and getting my security token with --serial-number and --token-code fixed the problem for me.
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