Does the new Service Principal account requires this "205478c0-bd83-4e1b-a9d6-db63a3e1e1c8" GUID as a must have rule of thumb or it is just an example?
New-AzADServicePrincipal -ApplicationId "205478c0-bd83-4e1b-a9d6-db63a3e1e1c8"
I have client asking that it is a must have AppID GUID value. Please clarify or update the documentation.
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@kiazhi, Thanks for the question! We are investigating and will update you shortly.
Hi @kiazhi!
That is an example and you can have the command generate the app ID by default be omitting the -ApplicationID switch. Will update the doc with proper command and screenshot.
https://docs.microsoft.com/en-us/powershell/module/az.resources/new-azadserviceprincipal?view=azps-4.3.0

@asudbring actually, your answer is misleading. The hardcoded GUID must actually stay hardcoded. That seems to be a global ApplicationId of the whole Microsoft.Azure.Cdn.
Too bad it is not explained well enough in the documentation! Because I also thought it was only an example Id and I somehow needed to find my own. A few hours of work just wasted.
@asudbring can you confirm what @M0ns1gn0r had shared regarding it is a global ApplicationId of Microsoft.Azure.Cdn that needs to be hardcoded? Thank you.
@kiazhi @M0ns1gn0r
This one is a confusing one. Now that I go back and look at it after I've worked with CDN for a little bit and I see that indeed, that is the app ID for CDN. I'll confer with the PM and add a note that your are adding the CDN service as an application so that it can access the keyvault.