What? You are trying to link your gas credit card with TurboTax? Or do you mean you are trying to pay your TurboTax fees with that card?
https://ttlc.intuit.com/questions/1901301-what-forms-of-payment-does-turbotax-online-accept
Or are you trying to do something involving your TT Visa?
For help with your pre-paid Visa card:
Call (888) 285-4169
There is a “Help” link in the top corner of the web site for the card:
https://www.turboprepaidcard.intuit.com/
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**