Use "scope" in stead of "scopes" parameter in redirect

main.go

@@ -261,7 +261,7 @@ func (a *App) AuthRequestRedirect(c echo.Context) error {
 	values := &url.Values{
 		"client_id":     []string{instance.ID},
 		"redirect_uri":  []string{a.Config.AppScheme + "://" + a.Config.AppHost + "/confirm"},
-		"scopes":        []string{strings.Join(a.Config.AppScopes, " ")},
+		"scope":        []string{strings.Join(a.Config.AppScopes, " ")},
 		"response_type": []string{"code"},
 		"state":         []string{authRequest.ID},
 	}