Sass and custom domains with Azure web app

I have an azure web app that is my fallback origin.
I want clients to be able to map their own domain to access the web app.
I have added the fallback origin ok but when I setup the dns for each customer, I get a certificate error that I think is coming from azure as it doesn’t recognise each customers URL (Domain)
I could resolve this by adding the customer custom domain to azure but I’m not convinced this is the correct way to do it as I don’t want to add each customers domain to the azure web app.
What step have I missed on cloudflare please?

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