Hi @genelibardi · Thank you for reaching out.
You need to first run below cmdlet to create the servicePrincipal:
New-AzADServicePrincipal -ApplicationId "205478c0-bd83-4e1b-a9d6-db63a3e1e1c8"
Read more: Tutorial: Configure HTTPS on an Azure CDN custom domain
-----------------------------------------------------------------------------------------------------------
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.