question

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Fax Admin asked Phong Vu commented

unable to text JWT authorization using Postman

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.

authentication
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3 Answers

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Phong Vu answered Phong Vu commented

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.

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Fax Admin avatar image Fax Admin commented ·

tried on Powershell too
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App client Id: avDmFoV208obAVOTmKzqMu

Auth flow is JWT only

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Fax Admin avatar image Fax Admin commented ·

surprisingly no log
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Phong Vu avatar image Phong Vu ♦♦ Fax Admin commented ·

It seems you use the wrong app client id. Here is the analytics of the app you gave me its client id.

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Fax Admin avatar image
Fax Admin answered

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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Fax Admin avatar image
Fax Admin answered

same for Postman looks like

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