Aria Operations 8.18
VIDM 3.3.7
Before upgrading to Aria Operations 8.18.x, the URL was https://vROPs_IP_or_FQDN/ui/. Now is https://vROPs_IP_or_FQDN/vcf-operations/ui/. The utilized automatic redirection is not supported for vIDM by design.
VMware SSO was introduced in the Aria Operations 8.18 release note in Single Sign-On (SSO) for VMware vSphere Foundation. More details can be found in Configure VMware Single Sign-On for VMware Aria Operations.