So I recently found out I could sell the cards in my inventory. When I first tried, I was notified I had to open the Steam app and find a setting under notifications. I never use the mobile app, and so figuring out how to get it to work and what QR code I needed to scan and have both devices authenticated. finally I've got it all set, but now on the mobile app, as well as the app on my PC, and the browser version in Chrome, clicking on sell will not bring up the window it had previously...have tried restarting both and logging in and out of each, no luck. What am I doing wrong?