If you’re working with the Paid plans and disable social networks, or disable Facebook, you might find you can’t use FaceBook Messenger.
This is by design.
If you use FaceBook Messenger please whitelist these domains:
api.facebook.com
edge-mqtt.facebook.com
graph.facebook.com
mqtt.c10r.facebook.com
portal.fb.com
star.c10r.facebook.com
Following the instructions in our Custom Allow Domains guide.