I experienced same case, after I login in browser website, it does not redirect to the mobile app.
I have read your page in FAQ: Custom auth plugins may be failing in the last step,not redirecting back to local/mobile, this will happen only if the plugin does not support correctly the $SESSION->wantsurl.
Could you please explain more about this? How do I know whether the plugin does/doesn't support the $SESSION->wantsurl? And how do I correct that (if that was the case)?
We will launch mobile app for the new semester, so any help would be really appreciated!