Adding custom fields to the registration page

Content

I have added a custom field into registration dialog page (AccountDropdown widget).

Looks like it does not take the new field/custom field added.  Is there any restriction on custom fields on registration page ?

pls look at the  last line of the code where I am trying to add new field.\

Format subject for clarity

Version

16.8

Code Snippet

             <rn:condition logged_in="false">
<rn:widget path="login/AccountDropdown" subpages="#rn:msg:ACCOUNT_OVERVIEW_LBL# > account/overview"
sub:input_Contact.Emails.PRIMARY.Address:label_input="#rn:msg:EMAIL_ADDR_LBL#"
sub:input_Contact.Emails.PRIMARY.Address:required="true"
sub:input_Contact.Emails.PRIMARY.Address:validate_on_blur="true"
sub:input_Contact.Login:label_input="#rn:msg:USERNAME_LBL#"
sub:input_Contact.Login:required="true"
sub:input_Contact.Login:validate_on_blur="true"
sub:input_Contact.Name.First:required="true"
sub:input_Contact.Name.First:label_input="#rn:msg:FIRST_NAME_LBL#"
sub:input_Contact.Name.Last:required="true"
sub:input_Contact.Name.Last:label_input="#rn:msg:LAST_NAME_LBL#"
sub:input_SocialUser.DisplayName:label_input="#rn:msg: DISPLAY_NAME_LBL#"
sub:input_Contact.NewPassword:label_input="#rn:msg: PASSWORD_LBL#"

sub:input_Contact.CustomFields.c.staff_id:label_input="#rn:msg:CUSTOM_MSG_STAFF_ID#"
/>