Your account can be freezed for the following reasons:   Not signed the eNPS application digitally via OTP in case you have applied on the basis of Aadhar no.  ii.   Non submission of the application documents at NSDL in case you have applied on the basis of PAN no.  iii. Non submission of the of the KYC documents for verification at the Bank where you have the savings account in case you have applied on the basis of PAN no. Please click on to the below mentioned link for any other NPS related frequently asked queries.