Intuit recently acquired Credit Karma; however, Credit Karma and TurboTax are separate products. You have to have separate accounts for both of these products. You can’t use your TurboTax info to sign in to Credit Karma and vice versa.
Changing any info on one account, like your email address, phone number, password, email preferences, and mailing address, doesn’t automatically change the info on the other.
Whether or not you have a Credit Karma account has no effect on your tax refund, including when you’ll receive it.
If you need help with your Credit Karma account, you should go to their help website.