If your N4 users will use the HTML5 prototype, which does not exist in AX, you must enable the User Defined 1 configuration flag on the web_WebProfileConfig property of each user prototype in your AX stations before running the migration tool.
Prerequisites: You have Workbench access to the remote station.
Expand the Config > Services > UserService > User Prototypes node in the station Nav tree.
To view the slot sheet, right-click the user prototype and click Views > Slot Sheet.
To access the configuration flags, right click the web_WebProfileConfig property.