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GraphiQL explorer fails to sign in because of cross-site cookie being rejected

When trying to sign into GitHub from I get an error.


I see an error at the address


>The change you wanted was rejected.

>Maybe you tried to change something you didn't have access to.


A cookie associated with a cross-site resource at was set without the `SameSite` attribute. It has been blocked, as Chrome now only delivers cookies with cross-site requests if they are set with `SameSite=None` and `Secure`. You can review cookies in developer tools under Application>Storage>Cookies and see more details at and


This is with Chrome 79 and the 'SameSite by default cookies' flag enabled, which will be the default in Chrome 80.