Service Accounts (formerly Solution Users) are no longer visible and cannot be managed from the vSphere Client UI.
VMware vCenter 9.x
This is an intentional design change to enhance security and prevent accidental modifications.
No action is required. The system automatically manages service accounts in the background, including automatic password rotation and the removal of unused accounts.
Although not visible in the UI, you can still list the existing Service Accounts using the CLI.
Run the following command on the vCenter appliance:
/usr/lib/vmware-vmafd/bin/dir-cli svcaccount list --login [email protected] --password '<password>'