ICF node for Service '&1', Namespace '&2' not available under node '&3'

What causes this issue?

To run this service with the external name &V1& and namespace &V2& with
the used URL the service needs to be activated first under ICF node &V3&
.

System Response

The system returns an error and does not process the request.

How to fix this error?

Activate service &V1& via the
<DS:TRAN./IWFND/REG_SERVICE>Activate Services</> transaction.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.