Hello to everyone,
this is my first post!

I tried to associate the recommended fields (firstname, lastname and display name) to username because I didn't use them but it didn't work and the fields were blank.

If I add with optional fields FirstName and Lastname it works but I don't found in the optional fields "Display name".

I made something wrong or is it a bug?

Leonardo

Well DotNetNuke users the fields First Name / Last Name as both user credential fields AND profile fields. When selecting the 'recommended fields' within the DNN Core Integration you are selecting the user credential fields, when selecting 'optional fields' you are selecting to link the profile fields.

The end result here is that you probably have to select the first / last name fields both under recommended fields and optional fields. This should do the trick. Now, for Display Name there shouldn't be anything special to setup other than selecting the dynamic field which represents the display name. Also, if you don't select the field at all it should be creating a display name for you based on the users first / last name.

-Chad