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I am new to SharePoint world.

I have created an app on SharePoint online. I have been trying to use Postman to get access token using Sharepoint online API but I am getting this error

AADSTS70000: Provided grant is invalid or malformed. error_codes:70000

My Postman request looks below: POST https://accounts.accesscontrol.windows.net/**realm_Id**/tokens/OAuth/2

Header: Content-Type: application/x-www-form-urlencoded

Raw Body:

grant_type=authorization_code
&client_id=xxxxxxxxxxxxxxxxxxxxxxxxxxxx (UTF8 encoded - **client_id@realm_id**)
&client_secret=xxxxxxxxxxxxxxxx (UTF8 encoded)
&code=xxxxxxxxxxxxxxxx (UTF8 encoded)
&redirect_uri=https%3A%2F%2Fwww.domain.com%2F (UTF8 encoded)
&resource=xxxxxxxxxxxxx%2Fdomain.sharepoint.com%xxxxxxxxxxxxxxx (UTF8 encoded - resource/domain@relamId)

When I send above request, I get error mentioned above.

I checked some other posts about this error & it was pointing towards making sure redirect_uri is same in configured app & API request above. I checked, it is same.

App has redirect_uri as: https://www.domain.co.nz/ (slash at the end).

Can you please help me understand what am I doing wrong here?

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