1. Your Dynamics domain must be licensed.
  2. You need to have a Custom Domain for the portal

To procure a SSL certificate for your Dynamics Portal, generate the CSR using the below steps:

Step 1: Download the tool DigiCertUtil and Install it in your system.

Step 2: Open this tool and click on Create CSR.

Step 3: Provide the required information and then click on Generate. Certificate type must be SSL.

Step 4: On the popup which follows, click - Save to File.

Now you have .CSR file to generate the SSL certificate.

Give this .CSR to company and then they will issue SSL Certificate.

Ensure that you get a .pfx file as required by Microsoft