Google OAuth - Precondition Failed?

It seems when trying the Google OAuth, I get stuck on the Continue API GET request. My Init works fine, but when running Continue with my code & redirect_URI I just get 

'{
code: 
ERROR_CODE_ACCESS_DENIED,

message: 
Precondition failed.
}

Any ideas? I haven't edited the API GET request at all.[chrome_TY1PQEtIqQ.png]
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