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Mobile and remote access login has not been enabled for the domain configured in the Expressway-C. The domain must be edited to allow Cisco UCM registrations.

SIP is disabled on the Expressway-E. The SIP protocol must be enabled on the server.

No Cisco UCM servers are configured in the Expressway-C. Servers must be added for CallManager and IM and Presence services.

Although a traversal client zone exists, there is no Unified Communications traversal client zone. One must be created.

Export a CSV list of users in the Cisco Webex Control Hub, set the Hybrid Calendar Service to TRUE for users to be enabled, then import the file back to Manage Users menu in the Cisco Webex Control Hub.

Set up an Auto-Assign template that enables Hybrid Calendar.

Select the Hybrid Services settings card in the Cisco Webex Control Hub and import a User Status report that contains only users to be enabled.

On the Users tab in the Cisco Webex Control Hub, check the box next to each user who should be enabled, then click the toggle for the Hybrid Calendar service to turn it on.

From Cisco Webex Control Hub, verify the domain that your Hybrid Calendar users will use, which

automatically activates them for the service.