Refresh Access Token always returns grant_type error
I am trying to refresh access token in box api using https://api.box.com/oauth2/token
and have added parameters - grant_type, clientId, clientSecret and refreshToken. also added Content-Typeapplication/x-www-form-urlencoded in the header. Still it everytimes shows grant_type mismatch error, even if I intentionally add wrong client id or secret, still same error is returned with response code - 400. Similar issue is generated on postman and official box api "try api" too.
Please help me how can I refresh the token
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