Flask Azure web app deployed successfully but showing default page

Please refer to my work steps and see if the error still shows up.:

As you found in the Managing Python on Azure App Service , Azure App Service provide you with a site extension. You could install packages on KUDU console.

Step 1 : Create azure web app and add Extensions(here is Python 3.6.4 x64)

Step 2 : Publish your flask project and add the web.config.

web.config:

<?xml version="1.0" encoding="utf-8"?><configuration>  <appSettings>    <add key="WSGI_HANDLER" value="<Your Project Name>.app"/>    <add key="PYTHONPATH" value="D:\home\site\wwwroot"/>    <add key="WSGI_LOG" value="D:\home\LogFiles\wfastcgi.log"/>  </appSettings>  <system.webServer>    <handlers>      <add name="PythonHandler" path="*" verb="*" modules="FastCgiModule" scriptProcessor="D:\home\Python364x64\python.exe|D:\home\Python364x64\wfastcgi.py" resourceType="Unspecified" requireAccess="Script"/>    </handlers>  </system.webServer></configuration>

Step 3: Switch to the Kudu CMD and commands cd Python361x64 and touch get-pip.py and copy the content of the url https://bootstrap.pypa.io/get-pip.py into the get-pip.py via Edit button, then run python get-pip.py to install the pip tool.

Step 4 : Install any packages you need via e.g: python -m pip install Flask

BTW,you could remove the default homepage.