I keep getting an error message when trying to enter a prepayment code. "Unfortunately, coupons can only be applied to the price of returns, not attachments." How to fix?

If you have mistakenly added a feature to your tax return that is not needed, you might have to have that feature removed prior to payment. Our Customer Support team will be better able to assist you with this payment matter. Please follow the instructions below to reach an agent:

https://turbotax.community.intuit.ca/replies/3152013