No matter how you like to participate in developer communities, Pulumi wants to meet you there. If you want to meet other Pulumi users to share use-cases and best practices, contribute code or documentation, see us at an event, or just tell a story about something cool you did with Pulumi, you are part of our community.

Pulumi Community

I can see it is part of the SDK - <https://github.com/pulumi/pulumi-azure/blob/v1.11.0/sdk/dotnet/Appservice/FunctionApp.cs#L917>

My package reference is to Pulumi.Azure 1.8.0-preview

That was obviously the issue. VS did not suggest any package updates, because *all* the SDK packages published so far are preview.

Updating to 1.11.0-preview added the property.

Awesome - glad this is now working for you