I have paid Duolingo on my old phone and now I want to install it on the new SHIFTphone 8.
I added my Google account to the SHIFTphone as Google microG account, logged using this account into App Lounge but when I try to install it the install button just turns into CANCEL and nothing happens. Also tapping the app to see details shows just blank screen.
OK, that link describes the issue I have. When logged in as Anonymous, I can install Duolingo, but then it is not linked to the Gmail account I have the Duolingo subscription in. And when I try to log in Duolingo, it says I already have an account and requests to log in using Google. I added my Google account besides microG one as Google one as well, but login via Google fails. So I can’t continue my progress in Duolingo using the application…
The trick is to ask for password recovery in the application. You then open the email using (in my case) Firefox browser and long-click the recovery button in the e-mail until context menu appears where you select open in external application. Use Duolingo where you will be prompted for the new password. Since then, the app is working! HALELUJA!