@FrankBarilugbene-3584, Apologies for the delayed response from over the weekend.
To better assist you on this, could you click on the arrow, to see if it provides additional insights into the error.
You could capture a network trace (when reproducing the error) via F12 developer tools (Network tab) in the browser to fetch more details on the error.
As outlined in this Azure doc note:
“Depending on the subscription type, a sufficient payment history may be required prior to creating an App Service Domain.
If you have made payments and are still running into this error, you can contact support and provide proof of payments.”
Also, ensure that all the prerequisites are met:
-You cannot buy App Service domains with free subscription credits.
-The following top-level domains are only supported by App Service domains: com, net, co.uk, org, nl, in, biz, org.uk, and co.in
-The web app's App Service plan must be a paid tier (Shared, Basic, Standard, Premium, or Consumption for Azure Functions), so ensure that the App Service app is in the supported pricing tier.
Thank you for reaching out regarding the error you are receiving when trying to purchase a custom domain.
We apologize for the frustration that you have encountered. Please let us know how it goes, I'll follow-up with you further.
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