I can't select account when I login my forum by Google

I was log out my account on my Android device(I want to log in the forum by another Google account), and when I click log in bottom, it isn’t jump to “Choose an account” interface, it log in the account I was log out.

I get the selector. Perhaps you need to make sure that you are logged in to the other account on Google before you get to use it to log in to Discourse.