It's possible that what your brokerage sent you was a license code, as opposed to a discount code.
A license code is a 16-character combination of letters and numbers in the XXXX-XXXX-XXXX-XXXX format. It verifies your software and allows you to finish installing and begin using TurboTax.
Please see the TurboTax Help article How do I find my license code for TurboTax Desktop? guidance. There is also contact information at the bottom of the article, in case the text doesn't apply to your situation.
