I filed my taxes with turbo tax and it says i need to sign up for Credit Karma to finish them. Is this true? Do i really need to sign up for credit karma?

i keep getting emails saying "you're almost done, sign up for credit karma to finish." but after i tried signing up for credit karma i cant be found in any of the databases. not even other credit sites. i was just wondering if i really needed to sign up for credit karma in order to complete my taxes because if thats the case then i'll use other software.