After doing some work on the virtual agent and embedding the solution in an internal SharePoint site I decided to share the properties needed to make the embedding work. The details provided on the service now docs site do not include all the necessarily information because there is no example of the values that need to be set on the properties. After contacting HI support and doing my own research I have found that the following way of setting the values works for all main browsers:

Property: com.glide.cs.embed.csp_frame_ancestors Value:host-source https://.com

Property: com.glide.cs.embed.xframe_options Value: allow-from https://.com

With the above property values you can use the remaining instructions on the ServiceNow docs site to embed the virtual agent in a external website: https://docs.servicenow.com/bundle/london-servicenow-platform/page/administer/virtual-agent/task/embed-va-standalone-client.html