That option has been deprecated for some time 
(the only references to that option are from blog and forum posts for 4+ 
years ago). You don't need that option for federated sign-in anymore 
though, as this functionality is now provided by Open ID Connect via the 
Google Identity Toolkit 

On Saturday, September 17, 2016 at 11:32:07 PM UTC-4, channing dev wrote:
> Hello,
> Why I can't see the "Experimental Federated Login" option in App Engine 
> Settings on my GAE projects?
> <>
> Thanks a lot.

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