How should UX designers review the completed web application and prepare a report about it?

How Should a UX designer review the completed app? What are the main credentials and How do you report if something is not working like expected? Do you have some check-list during your review or a template to write a report about the issues with the app? I'm looking for a path/suggestion to follow. Is there any source that can help me to review the app?

For instance, let's say all requirements covered. Does it mean the app is perfect from the UX perspective? Is there anything method to check the usability of the app? For the reporting part, Do you use any template to report issues such as interactions are not following the design or There are missing validations on some control?