Regarding SalesLoft 0Auth Login through Auth0

We are trying to integrate SalesLoft in our application.
We are implementing 0Auth2.0 Login with SalesLoft feature using Auth0 platform.
We have created Social custom Login App called SalesLoft on Auth0. When user clicks Login with SalesLoft user is able to redirect on SalesLoft Login Page.
After entering correct salesLoft credentials getting below exception
“error”: {
“message”: “Unauthorized”,
“oauthError”: “invalid_request”,
“type”: “request-error”
We are passing correct clientId and secret still getting above exception.
Who is throwing this unauthorized exception?
Why its giving this exception?
Please help us to resolve this issue.

Authorization Url :!/callback&response_type=code