When I launch an instance with AMI, I get an error: Client.InvalidKMSKey.InvalidState: The KMS key provided is in an incorrect state

Question

In the CDK code, I created a **custom KMSKey**, and then configured the Image Recipe of EC2 Image Builder to use the KMSKey as the encryption key of EBS, after successfully creating the AMI, I used the AMI to launch the instance, and the consistent message failed to start, the error is as follows:
**` Client.InvalidKMSKey.InvalidState: The KMS key provided is in an incorrect state`**.

KMSKey's state is **enabled**, otherwise the AMI would not be successfully generated, so I don't understand why the state Incorrect is still prompted.

I looked up the answer on the Internet and saw a post saying that it was a permission issue, and then I associated a role with an EC2 instance with an inline policy like this::
```yaml
{
	"Version": "2012-10-17",
	"Statement": [
		{
			"Sid": "VisualEditor0",
			"Effect": "Allow",
			"Action": "kms:*",
			"Resource": "*"
		}
	]
}
```

But the startup failed with the same error.

Does anyone know why?

Accepted Answer

Hello.

Does your KMS key policy allow access from your AWS account?  
Is there a policy in place to use KMS keys for the IAM user trying to launch EC2?  
https://github.com/hashicorp/packer/issues/12683#issuecomment-1889831463

How about using the following KMS key policy?  
```
{
  "Version": "2012-10-17",
  "Id": "key-policy",
  "Statement": [
      {
          "Sid": "Enable IAM User Permissions",
          "Effect": "Allow",
          "Principal": {
              "AWS": "arn:aws:iam::AWS Accout ID:root"
          },
          "Action": "kms:*",
          "Resource": "*"
      },
      {
          "Sid": "Allow use of the key",
          "Effect": "Allow",
          "Principal": {
              "AWS": [
                  "arn:aws:iam::AWS Accout ID:role/EC2 IAM Role"
              ]
          },
          "Action": [
              "kms:DescribeKey",
              "kms:Encrypt",
              "kms:Decrypt",
              "kms:ReEncrypt*",
              "kms:GenerateDataKey",
              "kms:GenerateDataKeyWithoutPlaintext"
          ],
          "Resource": "*"
      },
      {
          "Sid": "Allow attachment of persistent resources",
          "Effect": "Allow",
          "Principal": {
              "AWS": [
                  "arn:aws:iam::AWS Accout ID:role/EC2 IAM Role"
              ]
          },
          "Action": [
              "kms:CreateGrant",
              "kms:ListGrants",
              "kms:RevokeGrant"
          ],
          "Resource": "*",
          "Condition": {
              "Bool": {
                  "kms:GrantIsForAWSResource": "true"
              }
          }
      }
  ]
}
```

When I launch an instance with AMI, I get an error: Client.InvalidKMSKey.InvalidState: The KMS key provided is in an incorrect state

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