snedMessage method of Conversation API does not send work notes or system message as documented.Description<!-- div.margin { padding: 10px 40px 40px 30px; } table.tocTable { border: 1px solid; border-color: #e0e0e0; background-color: #fff; } .title { color: #d1232b; font-weight: normal; font-size: 28px; } h1 { color: #d1232b; font-weight: normal; font-size: 21px; margin-bottom: 5px; border-bottom-width: 2px; border-bottom-style: solid; border-bottom-color: #cccccc; } h2 { color: #646464; font-weight: bold; font-size: 18px; } h3 { color: #000000; font-weight: bold; font-size: 16px; } h4 { color: #666666; font-weight: bold; font-size: 15px; } h5 { color: #000000; font-weight: bold; font-size: 13px; } h6 { color: #000000; font-weight: bold; font-size:14px; } ul, ol { margin-left: 0; list-style-position: outside; } --> Symptoms When trying to use 'work_notes' as the field parameter of the sendMessage method in the Conversation API, the message is still posted as a comment. Release All Cause The Documentation is a bit incorrect and instead of passing two string parameters into the sendMessage method you should instead be passing an object. Resolution Call the sendMessage method with an object containing a body and field. Here is an example that should work in a connect action. var con = sn_connect.Conversation.get(conversation.sys_id);con.sendMessage({body: 'testMessage', field: 'work_notes'}); Here is an example that should work in a connect action. var con = sn_connect.Conversation.get(conversation.sys_id);con.sendMessage({body: 'Are you available?'}); Additional Information Documentation of the method. https://docs.servicenow.com/csh?topicname=c_ConversationScopedAPI.html&version=latest#conversation-sendMessage_String_String