At the end of Nevember 2018 I have created an Azure Web-App. For a static HTML page. Complete with app service and app service plan. And I created FTP access data for the site back then.
Now I want to activate an authorization by Azure AD. Only users from my Azure AD should be allowed to view the page. And for this I have to change settings in the App Service. The app still exists. In Azure Active-Directory I can still see it under App-registrations. The HTML page is still available at the URL created at that time (https://[name-of-app].azurewebsites.net). The FTP access data still works.
But the app service created back then and the app service plan used have disappeared. I cannot configure the app anymore. I cannot change the App Service Plan anymore. The app does not appear in any resource group either. I also do not remember deleting the App Service.
How do I get the App Service and the App Service Plan of the Web App back?
I am the owner of the Azure Subscription and I am the Global Admin of the associated Azure AD.


