Zoom meeting start_url is not able to override host's meeting username in native app

API and Webhooks Meetings
1

We created a meeting using create neeting endpoint (Zoom Meeting API) on behalf of the host created using ‘custCreate’ method.
My start url is Launch Meeting - Zoom
When host joins the link the username in the native app is not same as the name used on creating host with ‘custCreate’ method. Do we need to do something else?