eks describe-update fails for existing update-id

[marcusleite]

Describe the bug

When trying to read details on an EKS Addon update id by running
aws eks describe-update --name mycluster --update-id someupdateid

I got this error:

aws: [ERROR]: An error occurred (ResourceNotFoundException) when calling the DescribeUpdate operation: No update found for ID: someupdateid

Additional error details:
clusterName: mycluster
message: No update found for ID: someupdateid

I confirmed that the update-id used exists by running this command and it showed on the list
aws eks list-updates --name mycluster --addon-name coredns --output json

I can view details on the update ID on AWS Console with the same user, which indicates this isn't a permission issue from my org.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

I expected to be able to get details on an update-id as described on the docs.

Current Behavior

I got this error:

aws: [ERROR]: An error occurred (ResourceNotFoundException) when calling the DescribeUpdate operation: No update found for ID: someupdateid

Additional error details:
clusterName: mycluster
message: No update found for ID: someupdateid

Reproduction Steps

Requirements:

• EKS Cluster on 1.34 (not tested on auto mode)
• EKS Addon CoreDNS Addon installed on version v1.13.2
• Perform an update on it with some AWS CLI command, it doesn't matter if the update Suceeded or not.

Example:
aws eks update-addon --cluster-name mycluster --addon-name coredns --resolve-conflicts None --configuration-values '{"autoScaling":{"enabled": true, "minReplicas":3}}'

• List recent EKS Addon updates on this cluster by running this:
  aws eks list-updates --name mycluster --addon-name coredns --output json
• Obtain some id from the output of the previous command then run try to get the update details:
  aws eks describe-update --name mycluyster --update-id myupdateid

Possible Solution

No response

Additional Information/Context

All commands ran on US-WEST-2

CLI version used

aws-cli/2.34.21

Environment details (OS name and version, etc.)

Macos Tahoe 26.3 Python/3.14.4 Darwin/25.3.0 source/arm64

[marcusleite]

My bad, the doc mentions that the --addon-name is required if the update being checked is an addon update.

[github-actions]

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