Changing it to the code of our client's domain, it asks for further authorisation. But no error is generated, which is strange. Can you please tell me what is happening on the Habspot side, whether all requests from us are answered with 200, because we catch errors only if the integration is not installed. In other cases everything is fine. The domain of the HubSpot customer who encountered the problem: https://app.hubspot.com/domains/5123723 Screenshoots of an issue: