In my case the problem was the version of the extension bundles

What I had to do is:

Locate the `host.json` of your function app

Update the

  "extensionBundle": {
      "id": "Microsoft.Azure.Functions.ExtensionBundle",
      "version": "[3.*, 4.0.0]"
    }
  }

To

  "extensionBundle": {
      "id": "Microsoft.Azure.Functions.ExtensionBundle",
      "version": "[4.*, 5.0.0)"
    }
  }