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S3 bucket policies control access to the S3 bucket and its objects, not to KMS keys. You cannot grant a bucket access to a KMS key through a bucket policy. The principal (EC2 instance/IAM role) needs access to the key, not the bucket itself.
KMS key policies are the primary way to control access to KMS keys, and to use IAM policies to control access to a KMS key, the key policy must give the account permission to use IAM policies
https://docs.aws.amazon.com/kms/latest/developerguide/key-policies.html https://docs.aws.amazon.com/kms/latest/developerguide/control-access.html