On the Discourse Hub app, this is indeed a tricky workflow. We are hoping to improve it soon, but I would like to acknowledge that at the moment, this isn’t easy.
First of all, the email link workflow can’t easily launch the app. The way Apple picks which app to launch from an email link is incompatible with an app like DiscourseHub, it is doable, but it is an all-or-nothing situation that doesn’t work too well for many users (for example, users that want to have the hub but not use it for every single Discourse instance they’re on).
A second issue, is that the login flow uses the Safari session, for convenience. To switch back and forth between two accounts, currently you would need to:
- log out in Discourse Hub
- log out of the same community/account in Safari
- start the log in process again in DiscourseHub, when Safari is invoked, it should show you a login screen (not an already-authenticated session)
That should work. (It’s not easy for the median user, though, we need to improve this.)