Sign in required even I am already signed in to Account

I'm experiencing the same issue. I created several projects using the trial version, then I paid for the full version and I cannot use it. When I try to open my projects, I am prompted to sign in and taken to my account page which shows that I am already signed in. I have signed out and signed back in, reinstalled SL, re-booted my machine...not sure what else to try, but unable to use the product. I've walked through the steps in this article https://articulate.com/support/article/Articulate-360-Desktop-App-Can-t-Sign-In and the problem still persists.