Pop-up notifications that ask to login into an old Apple Account

Hi everyone, I keep receiving pop up notifications that ask me to login into an old Apple Account.

This happens since my first iPhone, which was used before by my father, at that time I must have done something wrong in setting up the iPhone, and now it keeps asking me to login into his account.

If I click on the notification, it says "Enter the password for your Apple Account to continue using iMessage on this iPhone: email"

And If I just press cancel, nothing happens, I can still use iMessage, and there is nothing wrong happening in my day to day use of the device.

But the notification is really annoying because it appears at least once every day. How can I solve this?