If your unit enrolment hasn't come through into Cloud Assess you can go to the Enrolments and Results tab -> select the required course and student right click on the student ( 1 ) and under the Enrolment tab select the Cloud Assess option ( 2 ) and then Enrol Student ( 3 ) which will send the enrolment through to Cloud Assess.
Please also see the below screenshot example for further clarification
As always if you need further assistance with this or any other issues please reach out to the friendly PowerPro support team!