Does anyone know how to move forward on the Challenge for Set up Social Sign-on? I keep receiving an Authentication Error Message.

I understand that Updating the Registration Handler was supposed to fix this.  I did so.  In fact, I saw others had this problem and updated the handler to their suggestions, and I am still getting the same error message.  I also went to the developer page for assistance on this matter, and I am still getting the same error message.  It will not authenticate Google for sign-on.  I am using the apex code that was in the challenge. 

• Apex code for the registration handler: https://github.com/salesforceidentity/IdentityTrail-Module3/blob/master/Module3RegistrationHandler.cls

I am in Trailhead and do not have a company that I am working with.  Could this be the problem?  I worry I will not be able to earn the badge for the Identity for Customers trail.