Disable changing email address

Hi @aoi0515

Thanks for writing in,

Please go to:
user-registration/includes/form/class-ur-form-field-user-email.php
and replace the lines from 50 t0 73 with the following code.

public function validation( $single_form_field, $form_data, $filter_hook, $form_id ) {

                $email  = isset( $form_data->value ) ? $form_data->value : '';
                $status = is_email( $email );

                if ( email_exists( $email ) ) {

                         // On multisite, ensure user exists on current site
                        if ( is_multisite() ) {
                                // assign user to blog and set their status to pending 
                                $user_data = get_user_by( 'email', $email ); 
                                if ( $user_data && ! is_user_member_of_blog( $user_data->ID, get_current_blog_id() ) ) {
                 
                                        add_user_to_blog( get_current_blog_id(), $user_data->ID, 'customer' );
                                        
                                        $user_manager = new UR_Admin_User_Manager( $user_data->ID );
                                        $user_manager->save_status( $status, $alert_user=false );
                                
                                } else {
                                        $error='Email alaredy exists on this site.';
                                }
                         } else {
                                $error='Email alaredy exists.';
                        }

                        if($error)
                                add_filter(
                                        $filter_hook,
                                        function ( $msg ) {
                                                return __( $error, 'user-registration' );
                                        }
                                );
                }
        }

I hope this helps.

Thanks!