You'll need to add a whole slew of hosts for intercom if you've got CSP in place (which you should).
Heres what you'll need to add:
connect-src: https://api-ping.intercom.io https://nexus-websocket-a.intercom.io https://nexus-websocket-b.intercom.io wss://nexus-websocket-a.intercom.io wss://nexus-websocket-b.intercom.io https://api-iam.intercom.io
script-src: https://widget.intercom.io https://js.intercomcdn.com
image-src: https://js.intercomcdn.com
Plus
and if you want to embed any videos in your in-app messages you'll need something like