Not being able to authenticate

[erikahlehmann]

Hi there!

• We graduated a non-UI App to production after meeting with all the promotion requirements.
• We are now able to send some test API calls through the developer portal (which generates a temporary bearer token for us).
• Despite the point of above, we can’t authenticate via our own code (which used to work out-of-the-box in sandbox). This applies specifically to our Stitch script that was previously syncing every hour in Sanbox and now fails at the OAuth endpoint with a 404 code.
• We have tried resetting the password with no success.

Any ideas on how we can troubleshoot this? Thanks in advance!

[erikahlehmann]

Here is what happens when we try to request an authentication token:

Error OAuth 2 Response 'Access Token' Request failed: bad request (400)
HTTP 400
---Body---
{
 "error" : "invalid_grant",
 "errors" : [ {
  "errorCode" : "OAU-140",
  "message" : "Invalid resource owner credentials"
 } ],
 "error_description" : "Invalid resource owner credentials"
}