Azure Function App Deploy from Azure Build Pipeline: 'credentials' cannot be null

Question

I am trying to create a build pipeline in Azure DevOps to deploy an Azure Function Application automatically as part of a continous integration pipeline. When the Function App Deploy step is run, the step fails with 'credentials' cannot be null.

Does anyone know why this happens?

My Build Pipeline:

The Log output when the step runs:

The only thing that I think that it can be is the Azure Resource Manager subscription which I am using Publish Profile Based Authentication however I have managed to create a similar pipeline for a web application with a deploy option using this authentication and it worked successfully. I just cannot deploy the function application.

Answer 1

This same problem also ocurrs with publishing web apps I found. There are two different tasks that can be used for web apps to publish and you have to use the right one.

There is a task called Azure Web App Deploy that works.

Also a task called Azure App Service Deploy that doesn't.

This is with Publish Profile Based Authentication.

I found that to deploy the Function Application you can also use the Azure Web App Deploy task and it seems to work.