How to Fix AWS Kiro Pro Plus Subscription 'UnknownError' Issue

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If you’re trying to assign a user to Amazon Q Developer Pro Plus (formerly known as Amazon CodeWhisperer Professional tier) and you see an “UnknownError,” it can be quite frustrating. Especially when you’ve double-checked your settings and everything looks correct. Here’s an easy way to troubleshoot and fix the issue.

First, make sure your setup for Amazon Q Developer Pro Plus is complete. This service needs an IAM Identity Center (sometimes called AWS SSO) organization instance, which you already have. It also requires that your subscription is managed properly through the AWS Management Console. The subscription allows you to assign licenses to users in your organization, so check that your subscription is active and that licenses are available.

Next, verify a few common points that might cause issues:

– Confirm that your IAM Identity Center organization instance is fully set up. Make sure the user you’re trying to assign exists in the directory and is marked as active.
– Check that your Amazon Q Developer subscription is active, and you still have licenses that haven’t been used up.
– Ensure all your resources are in the same region, particularly in your case, us-east-1. Mixing resources across regions can lead to problems.
– Look at the user account status. It should be valid and not in any kind of transition or suspended state from recent changes.

If you’ve gone through these checks and still get the error, the next step is to consider if there might be an issue on AWS’s side. Sometimes, this “UnknownError” indicates a backend problem that only AWS Support can investigate. They have access to internal logs that can help identify the root cause.

To move forward, open a support case through the AWS Support Center. Provide all the details you’ve collected—such as the Request ID and CloudTrail logs—which will help the support team diagnose the problem faster. Describe what you’ve already checked, so they can focus on deeper issues like account restrictions or backend outages.

Depending on your AWS Support plan, assistance might be faster, especially if this is impacting your production environment. Review your support options to see if you need a plan that offers quicker response times.

Following these steps should help you identify and resolve the issue, getting your users assigned properly to Amazon Q Developer Pro Plus.