You can limit access to CRM Online to users with trusted IP addresses to reduce unauthorized access. When trusted IP address restrictions are set in a user’s profile and the user tries to log in from an untrusted IP address, access to CRM Online is blocked.
- A subscription to Azure Active Directory Premium.
- A federated or managed Azure Active Directory tenant.
- Federated tenants require that...
Continued on Source: Restrict access to CRM Online with trusted IP Rules – Microsoft Dynamics CRM Team Blog