Once a MF NFO is listed it has to complete a minimum duration of three months to get on the clearing corporation pledge list. These are some internal audits and pre-defined policies approved by the board and the team at the clearing corp, they track the performance for a minimum period of three months post that they allow the MF scheme to be available in the approved list of securities. Once the scheme satisfies all the internal checks from the clearing corp it shall be available to pledge.
Further, contrary to this, you will see ETFs getting listed within a month’s time from the listing date, this is because the ETFs are considered as securities for the clearing corp and have different criteria.