Hi there. Just to double check - can you confirm you precede the redirect URI localhost name with http://? In your app’s redirect uri list it should appear as:
Since Cale handled the second error you are having, I’ll go back and address the first: regarding the deprecation warning you see in the console, are you using renderEl to display the widget, or a different method (showSignInToGetTokens or showSignInAndRedirect)?
There is a GH Issue with a similar report about this deprecation warning and we are tracking an internal ticket to update the Sign In Widget code to avoid this warning message that I recommend you monitor.
When you say the login action is not working, what do you see in the Network events? Is an authorize call being made and is the application getting back tokens?