National testing agency had released the JEE main 2021 results on 15th September. Maybe you are not following the proper steps/ not entering correct credentials that's why you are not able to access your result. You can get your results by following these procedures:

• Go to the NTA JEE Main 2021 official website - jeemain.nta.nic.in
• Click on  JEE Main rank list 2021 link available on the web page.
• Enter JEE Main application number and date of birth
• No, click on "Submit"
• The complete JEE Main 2021 result along with scores will appear on the screen
• Download the JEE Mains result page and save it for future reference
• You will also be able to see the ranks which is based upon your best performance in any of the four sessions.