Beneficiary ID or DP ID while applying for IPO?

Hello friends,
I am applying for Mahindra Logistics IPO through my IDBI net banking.
I selected CDSL.
Further it is asking for beneficiary id


Here I am confused
Should I enter the 8 digit beneficiary ID or the 16 digit DP id for IPO application as given in my profile page in Q.zerodha.com?
Any help would be much appreciated!!!

You must enter the 16 digit DP ID for IPO applications while applying for the IPO.