...
Starting from NIOS 8.6.3, the Route 53 integration feature can discover and synchronize the Route 53 DNS data from multiple AWS accounts of an AWS organization to NIOS by using a single NIOS admin account. For more information, see Amazon Route 53 Integration.
Support for Route 53 Integration on AWS GOV Cloud (RFE-11806)
Starting from NIOS 8.6.3, the Route 53 integration feature is supported on AWS GOV cloud. For more information, see Amazon Route 53 Integration.
Support for EBS Encryption (RFE-11931)
...