Once you’ve signed your CWA, allow 12-24 hours for your enrolment to reach your MyGov account.
https://https://www.humanservices.gov.au>
Centrelink / Menu / My family / Childcare / Enrolments / Look for the new enrolment.
Please note “enrolment period” will start from March or April & doesn’t necessarily need to match the dates your child physically attends vacation care.

https://www.humanservices.gov.au/individuals/online-help/centrelink/confirm-your-childs-enrolment-details-child-care-subsidy>