Log onto the Azure Portal, go to the App Services and select the App that you need to publish from Visual Studio to Azure.

Click on Get publish Profile. This downloads a Settings file.

In Visual Studio go to Publish and selete the "Import Profile" option.

Then import the Profile that you just exported from Azure. Done!

More Info Here: https://stackoverflow.com/questions/21098333/visual-studio-compiles-fine-but-it-still-shows-red-lines Visual Studio 2019 is showing red underline all the time, even when it compiles fine!

Closing Visual Studio and removing the .vs folder located in the solution directory worked for me.

This folder has a hidden attribute. You may need to change settings in folder options to show hidden files.