Hey @Gould, I just tried a workflow using credentials I hadn’t touched since a month (this one) and the OAuth2 credentials did not expire.
I wonder if Zoho’s API might require a special scope/query parameter for offline access/continued access without user interaction. For Google for example I needed to add a query parameter access_type=offline in the Auth URI Query Parameters field from your screenshot, otherwise no refresh token would be issued by Google (which is required to refresh the access token).
Do you have a link to the respective API documentation by any chance?