Bullet Points R Markdown

Publishing Your Results
1

I am trying to add bullet points to a slide in markdown.
The following "should" work but instead of a bullet point, I am getting a dash.
Any thoughts?

---
title: "NA"
author: "NA"
date: "February, 2020"
output:
  powerpoint_presentation:
    reference_doc: "template.pptx"
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(
  echo = FALSE,
  message = FALSE,
  warning = FALSE,
  fig.width = 13,
  fig.height = 7
  )

## Key Observations

* unordered list