To address a form submission issue on a dynamic website, I would start by using browser developer tools to inspect the console for any JavaScript errors or warnings. This often provides immediate insight into what might be going wrong. Next, I would check the network tab to ensure that the form data is being sent correctly and that the server is responding as expected. If there are any failed requests, I would examine the status codes and response messages for clues. Additionally, I would review the form's HTML and JavaScript code to verify that all elements are correctly referenced and that there are no syntax errors. If the issue persists, I would analyze server logs to identify any backend errors or exceptions that might be affecting the form submission. Throughout this process, I would document my findings and collaborate with team members if needed to ensure a comprehensive resolution.