Use this plugin as a must use plugin for any Fortress secured site where you are using AWS Alloy to manage your connections with Amazon Buy with Prime buttons.

fortress-aws-alloy-override.php

<?php
/**
 * Plugin Name: GridPane Fortress - Skip the check for a session being in sudo-mode for AWS Alloy connections.
 * Description: Companion plugin to the Fortress Security module to whitelist AWS Alloy connections.
 * Author: Stoute Web Solutions
 * Author URI: https://stoutewebsolutions.com
 * Version: 1.0
 */
 
 // This is a replication of the original whitelisted module for ManageWP found here: https://github.com/snicco/fortress/blob/beta/docs/modules/session/sudo-mode.md#skipping-the-sudo-mode-check-for-request-from-managewp

use Snicco\Enterprise\Fortress\Session\Infrastructure\Event\ShouldSudoModeCheckBeSkipped;

add_action(ShouldSudoModeCheckBeSkipped::class, function (ShouldSudoModeCheckBeSkipped $event) {
     
    // Alloy IPs provided by the AWS Buy with Prime Technical team. Your specific IP addresses may be different and should be confirmed with your AWS Buy with Prime account rep.
    $ips = [
      '54.160.36.113',
      '3.211.13.53'
    ];

    if(in_array($_SERVER['REMOTE_ADDR'], $ips, true)){
        $event->skip_for_current_request = true;
    }
    
});