certificateAuthorityArn
The Amazon Resource Name (ARN) of the CA that grants the permissions. You can find the ARN by calling the ListCertificateAuthorities action. This must have the following form:
arn:aws:acm-pca:<i>region</i>:<i>account</i>:certificate-authority/<i>12345678-1234-1234-1234-123456789012</i>
.