I followed the complete steps on this -- https://developers.ringcentral.com/guide/voice/quick-start#javascript
but end up getting a
Error: Unauthorized for this grant type
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You need to put more details here. What is application type you created in developer portal ( https://developer.ringcentral.com ) any one of below :
Browser-Based (web browser)
Server-Web ( web server)
Desktop
etc... Check this authentication type used in different type of app: https://developers.ringcentral.com/guide/authentication
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