Phone TurboTax Support, and explain your situation. They might ask for a copy of your emailed purchase confirmation from Amazon, but I don't know. But they will likely work with you one way or another.
Hours are 5AM-9PM Pacific (8AM-12 Midnight Eastern) 7 days/week.
You can use this contact form to get a phone number. There is a dropdown to indicate what product it's about. Indicate CD/download (and whether Mac or Windows.) Then indicate Home and Business Edition. Then in the issue line a brief statement or keywords, such as 2019 license activation code problem without quotes.
https://support.turbotax.intuit.com/contact
