CDN and/or Azure front door.

Hello,

During the installation proces, i installed wordpress without azure front door due to problems with the new region Belgian Central.
I added azure via App Service (Site) => tab Possibilities and then added Azure Front Door.

i added the variabels for AFD in the application settings.
The plugin W3TC was not activated. All worked well untill i activated this plugin.
CDN is now enabled in the plugin.
Do i need now to add CDN also to the app settings?
i guess not becaause AFD is already a CDN?
Application Settings | Value
CDN_ENABLED | true/false
CDN_ENDPOINT | cdn endpoint url

I think i still need to add the rules to AFD but has someone an overview what needs to be added for rules? With the picture it's a little bit unclear to me.

Thanks in advance.

ST