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1 answer
  1. Oct 18, 2016, 3:46 AM
    Hi Ruben Vasco,

    Make sure IP restrictions are disabled as well, and make sure that Permitted Users is set to "All users may self-authorize."

    Please refer below posts for similar discussion which has different solutions for such error see if that helps you.

    http://stackoverflow.com/questions/12794302/salesforce-authentication-failing

     

    http://stackoverflow.com/questions/34154385/getting-errorinvalid-grant-error-descriptionauthentication-failure-i

     

    https://help.salesforce.com/HTViewHelpDoc?id=remoteaccess_oauth_web_server_flow.htm&language=en_US

     

    Hope this helps you!

    Please mark it as Best Answer if my reply was helpful. It will make it available for other as the proper solution.

     

    Thanks and Regards

    Sandhya

     
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