Submit succession certificate by-passing nominee

One of my relative passed away this year & do not have any children of their own. I'm the legal heir (no ambiguity here). I'm in process of getting the succession certificate. I came to know that my relative was misguided by another family and has made them as nominee to multiple Bank/PO accounts. Question 1 - Can I go to Bank/PO and directly submit succession certificate along with other documents as required to claim the money from those accounts without notifying the nominee about this ? Note: Nominees to those accounts are not legal heirs. Question 2 - Some of the accounts are joint accounts wherein also the other account holder is not the legal heir. In this scenario - Can I go to Bank/PO and directly submit successtion certificate along with other documents as required to claim the money from those accounts without notifying the nominee about this ?