A cluster setup with a node with N2N enabled and IP family as IPV4 only.
From security> other settings , Cluster Encryption is selected as Strict.
Now login with https://172.23.97.164:18091 to access UI.
On XDCR page, Added remote cluster for same node with IP 172.23.97.164 (without port)
Remote cluster is created with "172.23.97.164:8091" where for strict Enforce TLS it should take 18091 itself.