To sell a stock, you will require a TPIN and an OTP. You will receive this TPIN/OTP via email and SMS. Note that a TPIN is generated and sent to your registered email ID and mobile number when you open a Demat account with Groww. To generate a new TPIN when selling, click on ‘Request New TPIN’. This TPIN will be valid for only 6 minutes after you receive it. If you cannot find the TPIN in your email inbox, check your spam folder. Please note that TPIN and OTP are sent to you by CDSL and Groww has no role in it.