If you experience an issue when entering your credit card, you can try saving your work and exiting the program to clear your cache and cookies.
Click here for How to clear your cache.
Click here for How do I delete cookies?
In addition, make sure your credit card address is the same as the address that you entered for your tax return.
Here are some other things you can try:
If this doesn't resolve your issue, you can contact Turbo Tax Support.
Please return to Community if you have any additional information or questions and we would be happy to help.