Submission ID error in response after update

Hi @mikesuccess,

Trust you are doing good, and thank you for reaching out to us.

Please try the following workaround.

<?php
add_action( 'plugins_loaded', 'wpmudev_forminator_add_entry_id_to_response', 100 );
function wpmudev_forminator_add_entry_id_to_response() {
	if ( class_exists( 'Forminator' ) ) {
		class WPMUDEV_Forminator_Add_Entry_ID_To_Response{
			private $form_id = 2910;//enter form_id here
			private $entry_id;

			public function __construct(){
				add_action( 'forminator_custom_form_submit_before_set_fields', array( $this, 'retrive_entry_id' ), 10, 2 );
        		add_filter( 'forminator_replace_form_data', array( $this, 'add_entry_id_to_response' ), 10, 3 );
			}

			public function retrive_entry_id( $entry, $form_id ){
				if( $this->form_id == $form_id ){
					$this->entry_id = $entry->entry_id;
				}
			}

			public function add_entry_id_to_response( $content, $data, $original_content ){
				if ( strpos( $content, '{submission_id}' ) !== false ) {
					$content = str_replace( '{submission_id}', $this->entry_id, $content );
				}
      			return $content;
			}
		}

		$run = new WPMUDEV_Forminator_Add_Entry_ID_To_Response;
	}
}

Please change the form ID in the above code from 2910 to your form ID. You may please add the code using a mu-plugin. Please find more details here: https://wpmudev.com/docs/using-wordpress/installing-wordpress-plugins/#installing-mu-plugins

Kind Regards,
Nebu John

Many thanks, Nebu, for your help. Have a nice day!