If you haven't got the password or registration ID via email then I would recommend you to search in your registered email spam folder. Sometimes these mails gets into spam folder so you should see and hopefully you will get here.

To know more about AIIMS Nursing click on the link below:

https://medicine.careers360.com/exams/aiims-nursing#:~:text=AIIMS%20Nursing%202021%20%2D%20All%20India,announced%20along%20with%20the%20notification.

I hope this answer helps. All the very best for your future endeavors!