This screen is present because Chromium Dash is hosted on AppSpot so that external users can access it at some point in the future, but we've yet to finalize all reviews & CLs necessary to feel comfortable exposing it to the public.  So, we've coded our own login screen to prevent non-Googlers from accessing the page until it's publicly available.  It's possible this could be coded better, but doing so would likely take a fair bit of time.

The date for public availability is coming up very fast - I'm hoping no later than Jan 1 2018.  So we have to prioritize between spending time fixing this issue, which is an annoyance but not the end of the world, vs. spending time on things that are blocking our public launch (which will get rid of this screen entirely).  My preference is to focus on the latter, which is why I will WontFix this and continue to work as hard as possible to make the page available to all with no authorization whatsoever.

That said, please reopen if you strongly disagree.  I do apologize for the inconvenience, but you won't have to experience it much longer.