Xendo uses the ZohoCRM API to connect to your data. The Zoho account you use to connect to Xendo needs to have the appropriate permissions to read the data you'd like to search via Xendo. Unfortunately, ZohoCRM's 'view-only' permission doesn't provide access via their API, so you'll need to contact your CRM administrator or Zoho support to change your system-level security settings.:
After you've successfully activated your API, you should be able to connect your account in the usual way in the Services Dashboard.