No, e-nomination is not mandatory for filing advance claims. Further, there is no last date for filing an e-nomination for your EPF account.
What are the different types of advances and eligibilities?
The Employees' Provident Fund (EPF) Advance Form, also known as Form 31, is typically used to submit a claim for a partial withdrawal or advance from the EPF account. Employees are not permitted to make ad hoc withdrawals from their EPF accounts. There are prerequisites for every type of withdrawal.
Source: EPFO website
No EPF nominee? How PF money will be paid after EPFO member's death
What is EPF e-nomination?
The e-nomination helps in transferring the benefits of Employees' Provident Fund (EPF) account holders to their dependents in the event of the account holder's untimely death. It enables nominees to access the account holder's EPF, Employees' Pension Scheme (EPS), and Employees' Deposit Linked Insurance Scheme (EDLI) funds online.
Members should make sure they submit their nominees, who will get both the PF amount and the pension. Nominations can be submitted for one or more members of his family, with the percentage of share specified.