"We are sorry, we are having trouble authorizing your credit card. Please verify your billing address, card number and CVV and try again."

[Gary_Hensley]

If you pay close attention you will know the reason for the rejection. When a purchase fails, Turbotax will display reasons such as:
"message": "The purchase failed: BANK ACCOUNT HAS BEEN CLOSED
"message": "The purchase failed: INSUFFICIENT FUNDS",
"message": "The purchase failed: DECLINED BASED ON FRAUD RULES"
"message": "The purchase failed: GENERIC DECLINE—NO OTHER INFORMATION IS BEING PROVIDED BY THE ISSUER.",
"message": "The purchase failed: ISSUER WANTS VOICE CONTACT WITH ACCOUNTHOLDER.",

The most common errors are "DECLINED BASED ON FRAUD RULES" and "ISSUER WANTS VOICE CONTACT WITH ACCOUNTHOLDER."

It's stupid. Because you may have purchased more than the allowed quantity of products (Turbotax allows you to buy 1 product at a time, but you bought 2 products products at the same time,...) Or you violate Turbotax's purchase policy. And the reason for that error is that your email address when purchasing does not match the email address you registered with your bank. It sounds stupid but that increases security and limits risks.
And there are many other reasons, in their security system to avoid risks that I cannot mention all.
You can see the error details as the screenshot I took below. It is simple and anyone can do it.
And up to now, it is impossible to fix such errors. If you have any way, please share it here.