BE: Provision unified routing in Customer Service with Omnichannel for Customer Service When Omnichannel for Customer Service is available but not deployed, in the Service Configuration Settings page, the following message will appear:
"Some required services need to be installed before unified routing can be turned on. Please contact Microsoft Support." F: Set up unified routing for records, prerequisites To set up record routing for Customer Service, unified routing must be enabled in your environment.
You must have users configured as bookable resource.
Etc.
Reference:
https://docs.microsoft.com/en-us/dynamics365/customer-service/provision-unified-routing
https://docs.microsoft.com/en-us/dynamics365/customer-service/set-up-record-routing