When was that? I've been using blockchain.info now blockchain.com wallet for 4 years now but the first time I sign up it's not asking for a secondary password and I created just last year and its not still not asking for a secondary password, you only need one password here but if you lose that password and you did not store the private key you cannot access it anymore.
It was always optional. I'm not sure if it was even possible to set one up at sign up, or if it was possible to set one up only later in somewhere in the settings.