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I am testing 'JWT authorization flow' but getting error
"errorCode": "OAU-250",

"message": "Unsupported grant type"

using : https://platform.devtest.ringcentral.com/restapi/oauth/token

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I don't want to use SDK as I will deploy on MS-SQL Server.

Can you double check the grant type of your app to see if it is JWT auth flow? Or let me know the app client id.

tried on Powershell too
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App client Id: avDmFoV208obAVOTmKzqMu

Auth flow is JWT only

So working Powersell Code to get the access token using JWT is

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DO NOT pass 'body' as below

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same for Postman looks like

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