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Invalid resource owner credentials using the API Explorer
Tags: authentication
Oct 11, 2019 at 4:49am   •   2 replies  •  0 likes

I created a new app on dev to access messages and have the credentials provided, however when I try to authenticate in the API Explorer I get the following error:

  "error": "invalid_grant",
  "errors": [
      "errorCode": "OAU-140",
      "message": "Invalid resource owner credentials"
  "error_description": "Invalid resource owner credentials"
2 Answers
answered on Oct 11, 2019 at 8:36am  

Not sure how you authenticate in the Api Explorer, but here is what you can try.

1. Login you dev portal at

2. Select the API Explorer menu

3. Choose one of the API to test. E.g. choose Voice -> Call Log -> Get User Call Log Records

4. Click Try It out and at the prompt, select the app you created from the list. Make sure that that app has the Read Call Log permission

answered on Oct 11, 2019 at 9:30am  

That seems to work, however I cannot use the main company number in the dev portal with the password I use to login with to make a request???? +14242140871

I am trying to retrieve message attachments via a c# program and it seems the number provided to authenticate does not work.


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