VCF Operations 9.x
VCF SDDC Manager 9.x
This is caused by a failure in installation of VCF where the installing appliance is prematurely changed to a completed SDDC Manager.
You will need to complete the VCF Installation before any of the hosts can be successfully onboarded into Operations for VCF Health.
Follow the instructions here to access the VCF Installer portion of your SDDC Manager appliance and troubleshoot/ complete the install: https://knowledge.broadcom.com/external/article?articleNumber=406634