FBA user management form to pass newly added fields parameters to the method: Utils.BaseMembershipProvider().CreateUser(txtUsername.Text, txtPassword.Text, txtEmail.Text, txtQuestion.Text, txtAnswer.Text, isActive.Checked, null, out createStatus);

[ccoulson]

I’ve replied to your duplicate of the question here:

SharePoint 2019 - Creating Custom Columns For The FBA Membership Request

The membership provider’s createuser function doesn’t allow for extra fields to be added, so you have to store them elsewhere, like in the SharePoint user profile using the code listed above. If you want to know how to call CreateUser, the actual code for the FBA Pack is available on Github. You can see the specific line here: