---
title: "Why do I get an 'Invalid Client' error when I try to generate a refresh token and provide it as an input to the connectors?"
url: https://docs.catalyst.zoho.com/en/faq/sdk/invalid-client-refresh-token/
description: "In Catalyst Connectors, this error will occur if you try to generate the token with the auth URL domain for a different data center (DC) other than your …"
last_updated: 2026-11-13T05:00:22Z
service: All Services
type: faq
---

In Catalyst Connectors, this error will occur if you try to generate the token with the auth URL domain for a different data center (DC) other than your Catalyst account's DC. You must ensure that you have generated the grant token (code), refresh_token and access_token for the same DC as your account.