Hello there,

When you create a domain with a KmsKeyId specified [1]: AWS SageMaker uses the KMS key to encrypt the EFS volume attached to the domain. As mentioned from AWS EFS documentation [2], after an EFS file system has been created, its encryption settings cannot be altered. As such you cannot change the KMS Key of an existing EFS file system.

References

[1] https://docs.aws.amazon.com/sagemaker/latest/APIReference/API_CreateDomain.html [2] https://docs.aws.amazon.com/efs/latest/ug/encryption-at-rest.html