Hi

Since the certificate you uploaded was invalid according to their guidelines i.e to be issued on or after April 2021 and there is no way you can change it The best thing is get in touch with them they will take the final call. They will verify the documents at the counselling anyhow so to be safe get a valid certificate issued by then and maybe they will accept it.

https://jeeadv.ac.in/contact.php

many candidates have jumbled it this year so I probably think they will let it pass hopefully.

Lets hope for the best and I strongly suggest you to relax and focus on the exam.