Captcha on .NET Framework MVC App not working

Hello everyone, I’m trying to migrate a web application based on .net framework to GKE, when running on premise or on localhost the application runs fine but after dockerize the captcha in my application does not appear. Has anyone here had the same problem? Or can anyone help with the solution? I use the .net framework version 4.7.2 and the captcha library uses CaptchaMvc.Mvc5