This How-To guide is an update for deploying external CA-signed certificates to pxGrid client using ISE versions 2.x+ and 3.x.
Update: March 2020 please make sure for any deployment you're running pxGrid 2.0 (this is up to the company you're working with integrating). Also if you're using ISE in an environment without a customer internal or well known PKI then you can deploy certificates using Internal Certificate Authority (CA) to Deploy Certificates to Cisco Platform Exchange Grid (pxGrid) Clients