NSX Management Service Operation Failed. (Initialization of Admin Registration Service Provider failed. Root Cause: The SSL certificate of the STS service cannot be verified)

The Problem

So I am new to supporting VMware from an infrastructure prospective and do to some departures at our company, our large VMware deployment is now my responsibility. 

A few weeks ago, I updated our expiring Vcenter custom machine certificate using the VMware SSL certificate tool. This Vcenter is still windows but thanks to these two articles, we were able to fix this issue:

Recently replaced our Vcenter custom machine certificate using the SSL cert tool. This Vcenter is still windows but thanks to these two articles, we were able to fix this issue:

https://techie.cloud/blog/2019/04/21/issue-setting-up-lookup-service-in-nsx-manager-6.4.4/ https://www.vembu.com/blog/replacing-vcenter-ssl-certificate-lookup-service/
VMware KB2121689