Not able to iniate the oauth for sandbox

we are requesting on the following URL

https://api-sandbox.upstox.com/v2/login/authorization/dialog?response_type=code&client_id=4dbbe828-c769-4de3-a28c-5a86753e3cd9&redirect_uri=https://www.google.com/

getting the following error on redirect URL

{“status”:“error”,“errors”:[{“errorCode”:“”,“message”:“Required String parameter ‘ucc’ is not present”,“propertyPath”:“ucc”,“invalidValue”:null,“error_code”:“”,“property_path”:“ucc”,“invalid_value”:null}]}

@Ketan