<p>Deletes tags from a <a href="https://docs.aws.amazon.com/kms/latest/developerguide/concepts.html#customer-cmk">customer managed key</a>. To delete a tag, specify the tag key and the KMS key.</p> <note> <p>Tagging or untagging a KMS key can allow or deny permission to the KMS key. For details, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/abac.html">ABAC for KMS</a> in the <i>Key Management Service Developer Guide</i>.</p> </note> <p>When it succeeds, the <code>UntagResource</code> operation doesn't return any output. Also, if the specified tag key isn't found on the KMS key, it doesn't throw an exception or return a response. To confirm that the operation worked, use the <a>ListResourceTags</a> operation.</p> <p>For information about using tags in KMS, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/tagging-keys.html">Tagging keys</a>. For general information about tags, including the format and syntax, see <a href="https://docs.aws.amazon.com/general/latest/gr/aws_tagging.html">Tagging Amazon Web Services resources</a> in the <i>Amazon Web Services General Reference</i>. </p> <p>The KMS key that you use for this operation must be in a compatible key state. For details, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/key-state.html">Key states of KMS keys</a> in the <i>Key Management Service Developer Guide</i>.</p> <p> <b>Cross-account use</b>: No. You cannot perform this operation on a KMS key in a different Amazon Web Services account.</p> <p> <b>Required permissions</b>: <a href="https://docs.aws.amazon.com/kms/latest/developerguide/kms-api-permissions-reference.html">kms:UntagResource</a> (key policy)</p> <p> <b>Related operations</b> </p> <ul> <li> <p> <a>CreateKey</a> </p> </li> <li> <p> <a>ListResourceTags</a> </p> </li> <li> <p> <a>ReplicateKey</a> </p> </li> <li> <p> <a>TagResource</a> </p> </li> </ul>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}