Add All In One invite Codes Validation to a Ultimate Member Registration Field

ultimate-member-invite-codes.php

<?php
/**
 * Validate field Mobile Number
 * @param string $key
 * @param attay  $array
 * @param array  $args
 */
function um_custom_validate_invite_code( $key, $array, $args ) {

	if(!function_exists('all_in_one_invite_codes_validate_code')){
		return;
	}

	if ( isset( $args[$key] ) ) {
		$result = all_in_one_invite_codes_validate_code( $args[$key], $args['user_mail'], );
		if ( isset( $result['error'] ) ) {
			UM()->form()->add_error( $key, $result['error'] );
		}
	}

}
add_action( 'um_custom_field_validation_invite_code', 'um_custom_validate_invite_code', 30, 3 );

hello, I have implemented this function following the guide and it works up to the check, however when I click on the register button it goes into error and does not create the account, what could be the cause of this error? if I delete the poersonalised field of the invitation code from the form instead it works.
Thank you