question

Kumar avatar image
Kumar asked Anirban answered

Getting Unauthorized grant type exception "OAU-250"

Created the application and trying to test the application. But while calling:

https://platform.devtest.ringcentral.com/restapi/oauth/token authentication api, getting:

400 Bad Request with Unsupported grant type

"errorCode" : "OAU-250", in response.. no Idea what's wrong this time

getting started
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1 Answer

Anirban avatar image
Anirban answered

This type of issues are common and reported multiple times in community previously.

If you're using an OAuth 2.0 request using the OAuth 2.0 password grant (grant_type=password), then your application you created should in the RingCentral Developer Portal should be Password flow .

Please note, application created with different platform type will have different grant_type.

For example, application created for platform type = browser based will have grant_type=Authorization Code | Implicit | Refresh Access Token where as application for platform type = Desktop/Windows will have grant_type= Authorization Code | Password flow |Refresh Access Token

So in order to use (grant_type=password) you need to have application created with platform type that support Password flow

Here is wonderful way it has answered with animated Gif image that will easily help you to understand the proccess: https://stackoverflow.com/questions/47692828/ringcentral-auth-token-failed-in-curl-call-unauthorized-for-this-grant-type/47745436#47745436

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Developer sandbox tools

Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.

Download RingCentral Phone for Desktop:

Tip: switch to the "sandbox mode" before logging in the app:

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  • On Windows: press "Ctrl + F2" keys