Mint FAQ: Why is Mint asking me to update my password? – Mint

Do I have to do this? If you would like to continue to use the same username (email) used for Mint with other Intuit products then yes. If you would prefer to have separate accounts with separate usernames, then you will need to update your username in either Mint or in the other Intuit product account(s) that share your Mint username first. This will dismiss the dialogue box from being presented in the future. To do this in Mint, simply hit ESC

via Mint FAQ: Why is Mint asking me to update my password? – Mint.