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Raneen KhouryRaneen Khoury 

error while trying to authenticate with salesforce SOQL App


I am trying to create new authetication through my application and I am getting {"error":"invalid_grant","error_description":"authentication failure"} error when trying to call the Token Request: "https://eu5.salesforce.com/services/oauth2/token"

Can u help me out why I'm getting this error ?
Best Regards , 
Raneen Khoury

Greg HGreg H
This is a good starting point: https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/intro_understanding_authentication.htm