[eluser]Lucas Alves[/eluser]
Edit: Now I read your question again. Your problem is that you probably didn't update the "columns" array in Ion_auth config file...
Why don't you just walk on meta_columns array, setting the additional data using this:
This way, when you add or remove columns in meta table, you just need to update the ion_auth config file, with no need to change the create_user code...
But, if you wanna do the way you're using this, you just need to set extra columns directly in the additional_data array, like