I am an admin on en. Using the mobile app on my phone, if I try to edit https://en.wikipedia.org/wiki/Sarah_Jeong, I'm denied access.
https://en.wikipedia.org/wiki/File:Screenshot_login.png
https://en.wikipedia.org/wiki/File:Screenshot_Edit_Failure.png
I wonder if it is because your only userright is "admin" and mobile doesn't recognize you as "extended confirmed".