Why has the exchange or depository sent an email asking to add a nominee to the Tradejini account?

As per SEBI clients must choose to opt-in or opt-out of nomination for their accounts. The Regulator has mandated Market Intemediaries like Exchanges and Depositories to ensure that in cases where nominee is missing for an account either a nominee is added or in case a person doesn’t want to add a nominee he has to specifically provide the same saying that he wants to Opt out of nominating for his account. Hence you are recieving a mail from them.

Tradejini highly encourages clients to consider adding nominee(s) to their account, emphasizing the importance of seamless succession planning.

For those clients who do not wish to nominate they must choose opt-out option in the nomination form.