4. Return Code Error 4
A "Return_Code=4" error is usually the result of incomplete or invalid eQuest user login information being sent from the ATS to eQuest. The two applications connect based on user login information. If the username and/or password is not an exact match in both systems, successful posting cannot happen.
If you receive this error when posting a job, please ensure the username and password passed from your ATS matches what has been setup in your eQuest admin portal
Note: Usernames and passwords are case sensitive.