I'm attempting to set up an Enterprise Portal collaboration with ArcGIS online, and noted that in the list of pre-requisites listed here: Create a collaboration—Portal for ArcGIS (10.6) | ArcGIS Enterprise that each participant is required to trust the SSL certificate used by the other participants. If my Enterprise Portal instance is internal, and uses a domain CA signed certificate, how can I go about registering this with ArcGIS Online? If this is not possible, would this mean that my internal Enterprise portal must use a commercial CA, such as digicert?
