Aws-cli: An error occurred (KMS.NotFoundException) when calling the PutObject operation: Invalid keyId aws/s3

[luisamador]

I'm trying to run this command from an EC2 instance that is assuming a cross account IAM role.

aws s3 cp config s3://my_bucket_blah/hi.txt --region eu-west-1 
upload failed: ./config to s3://my_bucket_blah/hi.txt An error occurred (KMS.NotFoundException) when calling the PutObject operation: Invalid keyId aws/s3

The cross account IAM role has "kms:*" permissions on the remote account.

obviously the aws/s3 key which is reporting as invalid exists on the remote account where the S3 bucket is hosted

I'm completely stuck with this.

[luisamador]

Fixed the issue by adding --sse=aws:kms to the command above to make it work.

aws s3 cp config s3://my_bucket_blah/hi.txt --sse=aws:kms

The error message is not very helpful.