As per the  NSE circular your PAN has to be linked to the Aadhaar before the 31st of March 2022.

From the month of April, 2022 PAN Card not linked with Aadhaar will be considered as invalid for the purpose of trading in the Securities Market. It is therefore better to ensure that the PAN - Aadhaar linking is done before the due date.

If you haven’t yet linked your Aadhaar to your PAN, here are two ways you can do this:

Online from the Income tax portal here.

Alternatively, you can send an SMS to 567678 or 56161 to link or check the status:

Type a message in following format:

UIDPAN <space> <12 digit Aadhaar> <space> <10 digit PAN>

Send the message to either 567678 or 56161 from your registered mobile number

If the information provided is correct, the Aadhaar will be linked to PAN successfully