[Guide (for apps)] Duolingo says "Email already taken" when I try to log in my account: I'm stuck!
To solve your issue, please follow the steps described below by clicking on the text/button designated by the purple arrows in each step.
Right-click then select "Open in a new tab" to enlarge the image.
iOS (Duolingo v4.5.9)
Remark: version of this Guide for Windows Phone apps and for more recent version of iOS app to come.
Not surprising, cf "iOS (Duolingo v4.5.9)".
But maybe you can share the how to solve, step by step with screenshots, this issue on iOS5?