Make sure you are connected using the GoodAccess Client App.
Log in to Zoho CRM using an account with admin privileges.
Go to Setup -> Zoho Directory -> Security Policies.
Go to Allowed IPs, then click on Add IP address.
Select the first option (make sure you are connected using GoodAccess.) and continue with Add.
Congratulations! From now your Zoho CRM page will be protected and accessible only by your team connected through the GoodAccess Client App.