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Sign ins on Apple's iOS devices using Safari were not working properly due to how Safari handles cookies after redirect from the Sign In page. This caused first sign in attempt always fail and the user was required to refresh the page or sign in again.
A fix was implemented to work around this issue and now sign ins work as expected on all platforms.
Those who are into web development can read more about the issue here https://bugs.webkit.org/show_bug.cgi?id=188165.
Update live date: 2020-01-07