Problem in auto login after registration

you should do so:

...} else {
                
                
                $site_url = get_site_url()."/myloginpage/";
                
                $has_success = true;
                $message[] = "Successful registration";
                
                global $wpdb;
                $key = $wpdb->get_row($wpdb->prepare("SELECT ID,user_activation_key FROM $wpdb->users WHERE user_login = %s",$usermobile));
                add_user_meta($key->ID,'usermobilenum',$usermobile);

                wp_set_current_user( $newUserID, $usermobile );
                wp_set_auth_cookie( $newUserID );
                //do_action( 'wp_login', $usermobile );
                    
                
                $redirecturl = site_url('/?signup=true&login=too');
                wp_redirect( $redirecturl );
                exit;

            }

        }
    }
}