Hello. It is not possible to notify NTA about errors in the final answer key. The last day to challenge the answer key prior to the result was 17th January. NTA has declared that 22 questions were incorrect in the JEE Mains paper and marks have been awarded to all students for that.

For more details about the wrong questions check the below link.

https://engineering.careers360.com/articles/jee-main-answer-key

Hope this helps. For further queries comment down below.