Salesforce app account owner sync issue

I have installed the Salesforce App
I have all fields syncing between contacts, accounts etc.
I have setup the “Maintain lead and account ownership” section and it maps all the right Salesforce users with Intercom users. But….

The only field it will not update in intercom is the user/lead owner. This is the one field I need so new conversation are assigned to the correct person. 

Has anybody come up against this before?