The suggestions made by Intuit/Turbotax don't work. I've had this problem with both my 2019 and 2020 TurboTax Premier, both of which I purchased from Costco. Costco is a licensed reseller. After I spent 1.5 hours on the phone with a support person last year dealing with this with TurboTax Premier 2019, they finally gave me a new install and new key. Looks like I'm going to have to waste more of my time again this year getting the same for 2020. You'd think after they had this problem with 2019 they'd have fixed it for the following year, but the same problem still exists. Very annoying and a huge time waster for consumers.
