Secure Messaging with Clients via the Client Portal is an add-on WebABA feature.
Ensure that an Administrator has turned on Secure Messaging.
The Inbox (envelope icon) contains all Secure Messages sent to and from Clients.

Related Articles:
Secure Messaging with Clients via the Client Portal is an add-on WebABA feature.
Ensure that an Administrator has turned on Secure Messaging.
The Inbox (envelope icon) contains all Secure Messages sent to and from Clients.