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Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
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@Emre Can , Thanks for posting the question. I see that in the screenshot, the Azure Portal error details are in non-English, could you please copy the error message and share some more details about your scenario?
In the interim, please checkout the step-step tutorial: how to add and Secure a Custom Domain on Your Azure App Service Web App
Also, you may check, "You can't purchase a domain" document section for some pointers.
-- This is an English global support. It would be helpful, if you can translate your question (from screenshots) in English.