Why can't select account as same as PC?

Hi there!

I using Cloud Save and Authentication services to sign in to use Cloud Save
and when I tested on PC everything seem to be ok, I can choose what account I want to connect.
like this…

But when I tested on my iPhone…

I can’t select an account, and then I trying to sign in with email
as same as Google account 2
But it show me “This email isn’t connected to Unity Player Account” ?

Actually I have 2 Google accounts for test
But I can’t select what account I want on mobile, it automatically choose
account for me if I press continue with Google Button,
so I want to select it myself first!

What happen or what wrong?
Thanks!!!

Ahh… No one…