Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
Update- Here the issue is with managing DNS entries after the removal of the 'Advanced Management Portal'. They are trying to transfer their domain, igniterecognition.com, out of Azure but are unable to find their DNS entries in Azure DNS. It was mentioned that they purchased the domain before 2017 and it was not linked to Azure DNS. Resolution- DNS entries can be seen using- www.digwebinterface.com Also suggested to use this document for Azure DNS- Quickstart: Create a public DNS zone and record - Azure portal - Azure DNS | Microsoft Learn