Redirect Callback URLs form cannot be saved — App ID 1701270990880845

"The Redirect Callback URLs field under Threads API Settings will not save for my app. I receive 'Form can't be saved' every time, regardless of what URL I enter. I have tried multiple browsers, multiple apps, and multiple redirect URLs including real HTTPS domains. App ID: 1701270990880845. Please whitelist this redirect URL on your backend: https://seoulcosmeticsurgery.com/threads-auth.php"