Issue:
When calling the /oauth/token API to authorize your application, you may encounter the following error:
{
"error": "unauthorized_client",
"error_description": "Unauthorized for this grant type"
}Possible Causes:
-
Your application is attempting to use a grant type (e.g., Authorization Code Flow or JWT) that is not configured in your app settings.
-
There is an error in your implementation of the selected grant type.
-
You are using a grant type that is no longer supported.
Important Notice: Password Grant Type No Longer Supported
RingCentral no longer supports the Password Grant type. If your application was previously using it, you must update to JWT or another supported grant type.
Resolution Steps:
-
Check your application's settings to ensure your code is using an OAuth grant type that is correctly configured.
-
Use a RingCentral SDK to handle the authorization process.
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If implementing OAuth manually, ensure that your implementation follows the correct technical requirements.
Additional Resources:
By following these steps, you can resolve OAuth authorization issues and ensure your application is properly authenticated.
