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Trev RaicesTrev Raices 

No_Oauth_Token: invalid_grant Code was already redeemed

I am STUCK on this Trailhead module.   Setting up external social sign on...

I'm able to sign on with Google credentials but nothing past that, I am not asked to allow Salesforce app and I never see the Google icon I placed on the external login page.
NagendraNagendra (Salesforce Developers) 
Hi Trev,

Please check with below link from forums community on how to successfully pass the above challenge. Please let us know if this helps.