Expand the Azure resources view so that App Services are loading...
Run the "Deploy to Web App..." command and select a web app.
It will throw a "Cannot read properties of undefined (reading 'createClient')" error because the node returned by pickAppResource is the default item, and not the branch data provider item.
How to reproduce:
This behavior is causing https://github.com/microsoft/vscode-azureappservice/issues/2440