OAuth2 Failed using posman

I created OAtuh2 Client at ERPnext

and tried to get

but i get Error: connect ECONNREFUSED

can anyone help me how to setup OAuth using posman?

Did you try this already?

i using
ERPNext: v12.16.2 (version-12)
Frappe Framework: v12.13.0 (version-12)

what i want to do is after client login, it return a login form and OAuth2 to authenticate the user.
After that, exchange the token for Authorization Code Grant with ID Token.

I read through this
but seem like i not yet found a solution