If your discount is not showing up in your shopping cart, please clear cache & cookies & try again.
Try this:
Sign completely out of Turbo Tax. Clear your cache and cookies depending on your operating system by following the directions below. Go back to your email and click on the link within the email and it should apply at this point.
Clearing Cache:
https://ttlc.intuit.com/replies/3302272
Deleting Cookies:
https://ttlc.intuit.com/replies/3301745
[Edited 3/25/19 5:42PM CST]
NM ... try this as well:
What kind of discount code do you have? Can you provide some more details? @scherergenius